Help me in question b

The probability that a student studied for exactly 1 hour is 0.23 Or 23%. The correct option is A.

Probability is the chance of occurrence of a certain event out of the total no. of events that can occur in a given context.

A table is given where the first column represents the number of hours a student studied math and the second column represents the number of students.

The sum of the second column is 30. So it is the total number of students. And only 7 of them studied mathematics for 5 hours.

Therefore, The probability that a student studied for 5 hours is,

= 7/30.

= 0.23 or 23%.

Therefore, the correct option is A. 23.0.

To learn more about probability, refer to the link:

https://brainly.com/question/30034780

#SPJ1

The question is incomplete. Your most probably complete question is given below:

23.0

0.70

0.23

0.16

The additive inverse of 3/7 is -3/7, and the multiplicative inverse of 3/7 is 7/3.

A number that gives 0 after adding with its is called an Additive inverse and it gives 1 after multiplication with its is called a multiplicative inverse.

Here, the given number is: 3/7

Let, x be the additive inverse of the number:

3/7+x=0

x=-3/7

Thus, the additive inverse of 3/7 is -3/7.

Now, let y be the multiplicative inverse of 3/7,

⇒3/7*y

⇒1*y=7/3

Thus, the multiplicative inverse of 3/7 is 7/3.

Hence, the product of additive inverse and multiplicative inverse of minus 3 upon 7

⇒-3/7*7/3

⇒-1

To know more about the Additive inverse:

https://brainly.com/question/1548537

#SPJ4

Answer:

[tex]\boxed{\mathrm{Option \;D: 5x^4-37x^3-6x^2+41x-6}}[/tex]

Step-by-step explanation:

You can solve such multiple choice questions using a trick. This especially is useful in a time constrained question

Consider only the coefficients of the terms relating to x⁴ and the constant

If you expand (-4x³ + 5x - 1)(2x - 7) this will work out to

(--4x³) (2x) +..... + (-1)(-7)

This will result in (- 8x⁴ +..... + 7)

Since there is a negative sign before this last term, expanding will change the signs of the terms

-(-8x⁴ + ..... + 7) = 8x⁴ -7

Add the coefficients of the x⁴ terms to get

(5 - 8 + 8)x⁴ = 5x⁴

Add the constants of the individual terms

--1 + 2 - 7 which is -6

So the simplified polynomial is of the form

5x⁴ +....... - 6

Only option D fits these values, so the correct choice is Option D:
[tex]\mathrm{5x^4-37x^3-6x^2+41x-6}[/tex]  

ANSWER

--------------------------------------------------------------------------------------------------

If you want to do it the hard way,

First evaluate the last product using FOIL:
[tex]\left(-4x^3+5x-1\right)\left(2x-7\right)\\\\= \left(-4x^3\cdot \:2x-4x^3\left(-7\right)+5x\cdot \:2x+5x\left(-7\right)-1\cdot \:2x-1\cdot \left(-7\right)\right)\\\\= \left(-8x^4+28x^3+10x^2-37x+7\right)\\\\[/tex]

With the negative sign in front of this expression this becomes:

[tex]-\left(-8x^4+28x^3+10x^2-37x+7\right)\\\\= 8x^4-28x^3-10x^2+37x-7\\\\[/tex]

From the original polynomial expression, group like terms:

[tex]\left(5x^4-9x^3+7x-1\right)+\left(-8x^4+4x^2-3x+2\right)-\left(-4x^3+5x\:-1\right)\left(2x-7\right)\\\\[/tex]

[tex]=\left(5x^4-9x^3+7x-1\right)+\left(-8x^4+4x^2-3x+2\right) + (8x^4-28x^3-10x^2+37x-7)\\\\[/tex]

So, the y-coordinate of the solution of the system of equations 3x + 2y = 7 and y - 3x = 11 is 6.

To find the y-coordinate of the solution of a system of equations, we can use one of the methods for solving systems of equations, such as substitution, elimination, or graphing. In this case, we will use substitution method.

The system of equations is:

3x + 2y = 7

y - 3x = 11

We can solve for y in the second equation and get:

y = 3x + 11

Now we can substitute this expression of y into the first equation:

3x + 2(3x + 11) = 7

3x + 6x + 22 = 7

9x + 22 = 7

9x = -15

x = -5/3

Now we can substitute this value of x into the second equation:

y = 3(-5/3) + 11

y = -5 + 11

y = 6

So, the y-coordinate of the solution of the system of equations 3x + 2y = 7 and y - 3x = 11 is 6.

To learn more about y-intercept

Visit; brainly.com/question/14180189

#SPJ4

The assumption we would make to start the indirect proof of AB is congruent to BC is AB + BC.

Indirect Proof: 

Step 1 Suppose a right triangle's hypotenuse is not the longest side. That is BC > AB and AC > AB.

Step 2 If BC > AB, then ∠C < ∠A. Since m C = 90, ∠A > 90. So, ∠C + ∠A > 180. By the same

reasoning, ∠C + ∠B > 180.

Step 3 Both connections counter the fact that the sum of the measures of the angles of a triangle equals 180.

Thus, the hypotenuse must be the longest side of a right triangle.

Hence, the correct option is C.

--The given question is incorrect; the correct question is

"What assumption would you make to start the indirect proof that AB is

congruent to BC?

A. A ≠ B

B. B ≠ C

C. AB + BC

D. BA < CB​"--

To know more about right triangle, here

https://brainly.com/question/4364353

#SPJ4

The inverse of a function in vertex form can be determined by substituting the function in the standard form of a quadratic function

The various steps to find the inverse of a function in vertex form can be noted as -

Read more about vertex form on:

https://brainly.com/question/30285010

#SPJ4

Answer:0 on his road trip playlist

Step-by-step explanation:

Answer:

371 meters

Step-by-step explanation:

This is a triangle trigonometry problem. The phase "angle of depression" means the angle looking down to the boat instead of looking straight out from the top of the tower. See image. You can then find the rest of the angle is 70°. Looking at the boat creates one line, the tower is another side, 135m, and the distance to the boat is the third side of a triangle. See image.

Tangent is a trig ratio. It compares the side opposite from the angle to the side next to (adjacent) the angle. We can then write an equation. Unless the teacher/program/text gives you tan 70°, you need a calculator to find it.

tan 70° = x/135

Multiply both sides by 135.

135 tan 70° = x

Put this in a calculator.

135 × tan70°

it comes out a long decimal. But the directions said to round to the nearest meter.

The boat is about 371 meters away from the foot of the tower.

Answer:

lol i don't know this

Step-by-step explanation:

lol= laugh out loud

The coordinates of point E on the parallelogram are given as follows:

(3, -2).

The coordinates of point E are obtained considering that the point E is the midpoint of segment AC, hence it's coordinates are the mean of the coordinates of A and C.

Then the x-coordinate of point E is obtained as follows:

x = (1 + 5)/2 = 3.

The y-coordinate of point E is obtained as follows:

y = (1 - 5)/2 = -4.

More can be learned about the midpoint of a segment at https://brainly.com/question/24682140

#SPJ1

The answer of 10 more than 99 is 109.

The answer of 10 more than 99 is 109 which can be derived using simple mathematical calculations.

To find 10 more than 99, you can add 1 to the original number 99.

10 + 99 = 109

It's a simple arithmetic operation where you add a specific number, in this case, 10, to the original number.

An arithmetic operation is a mathematical process that combines two or more numbers to produce a new number. The most basic arithmetic operations are addition, subtraction, multiplication, and division.

Addition: It is the process of combining two or more numbers to find their sum. For example, 2 + 3 = 5 is an addition operation.

Subtraction: It is the process of finding the difference between two numbers. For example, 5 - 3 = 2 is a subtraction operation.

Multiplication: It is the process of finding the product of two or more numbers. For example, 3 x 4 = 12 is a multiplication operation.

Division: It is the process of finding the quotient of two numbers. For example, 12 ÷ 3 = 4 is a division operation.

Therefore, The answer of 10 more than 99 is 109.

To learn more about arithmetic operations,

Visit; brainly.com/question/16679150

#SPJ4

The inequality statement will be x-5 ≤ 6.

Inequalities are mathematical expressions that contain variables and numerical terms that are separated by the inequality symbol.

An inequality can be derived from a statement of words, which must be correctly interpreted in order to yield the appropriate inequality.

When there are more than and fewer than values in the inequality, we know that the variable must be in the middle.

The inequality symbols are greater than, less than, greater than or equal, and less than, or equal.

There are two conditions given in the question as mentioned below:

1. Five less than a number

2. the number is less than or equal to 6

Let x be the number,

x-5 ≤ 6

So, the inequality statement will be x-5 ≤ 6

To know more about inequality visit: brainly.com/question/30231190

#SPJ4

Answer:

V ≈ 13036 ft³

Step-by-step explanation:

the volume (V) of a cylinder is calculated as

V = πr²h ( r is the radius and h the height )

here diameter = 19, then r = 19 ÷ 2 = 9.5 and h = 46 , then

V = 3.14 × 9.5² × 46

   = 3.14 × 90.25 × 46

  ≈ 13036 ft³  ( to the nearest whole number )

Answer:

170 and 130

Step-by-step explanation:

The error interval for the area of the shaded region is given as follows:

56.6 < a < 56.8.

The area of the circle is of 78.1 cm², rounded to one decimal place, hence the interval for the area of the circle is of:

78.05 <= area circle < 78.15.

The area of the square is of 21.4 cm², rounded to one decimal place, hence the interval for the area of the circle is of:

21.35 <= area square < 21.45.

The error formula is:

Area circle - Area square.

The minimum error is when the area of the circle is the greatest and the square is the least, hence:

m = 78.15 - 21.35

m = 56.8.

The maximum error is when the area of the circle is the least and the square is the greatest, hence:

n = 78.05 - 21.45

n = 56.6.

Meaning that the error interval is of:

56.6 < a < 56.8.

More can be learned about error interval at https://brainly.com/question/28817420

#SPJ1

The range is calculated as follows by combining the lowest and highest values. Organize the information in ascending or descending order first, then calculate the maximum and minimum values.

The range of a particular data set is the distinction between those maximum and minimum values. Range = Maximum Value–Minimum Value

The range of a set of data is the differential between the collective's maximum and minimum values.

Domain and range are keywords in relations and functions. The range is the set of all potential dependent values produced by a relation from a domain value.

To identify the range, first, arrange the data in ascending or descending order to gain a clear picture of the data's Maximum and Minimum terms.

Then, to get the data range, subtract the lowest value from the largest value in the collection.

To know more about Range visit:

https://brainly.com/question/30067462

#SPJ4

The zeros, y-intercept and vertex for the given quadratic equation f(x)=       (x + 1)² + 4 are respectively,

Zeros-  (-1 + 2i)

Y-intercept- 5

Vertex- (-1, 4)

An equation is a mathematical term, which indicates that the value of two algebraic expressions are equal. There are various parts of an equation which are, coefficients, variables, constants, terms, operators, expressions, and equal to sign.

For example, 3x+2y=0.

Types of equation

1. Linear Equation

2. Quadratic Equation

3. Cubic Equation

Given that,

f(x) = y = (x + 1)² + 4

y = (x + 1)² + 4

y - 4 =  (x + 1)²

So, for vertex

x + 1 = 0

x = -1

y-4 = 0

y = 4

For Zeros, y = 0

y-4 = (x +1)²

(x +1)² = -4

x = -1 + 2i,   -1-2i

the zeros are imaginary

For y intercept, x = 0

y-4 = (x +1)²

y   = 4 + (1)²

y   = 5

Hence,  vertex, zeros, and y-int. are respectively (-1, 4), (-1 + 2i), 5

To know more about Equation check:

brainly.com/question/1529522

#SPJ1

The distance between the given set of points is 7.8 units.

To find the distance between two points in a coordinate plane, we can use the distance formula.

The distance formula states that the distance between two points (x1, y1) and (x2, y2) is given by the square root of ((x2 - x1)^2 + (y2 - y1)^2).

In this case, we are given the points p(8, 2) and q(3, 8). Therefore, we can plug in the coordinates of these points into the distance formula:

Distance = √((x2 - x1)^2 + (y2 - y1)^2)

Distance = √((3 - 8)^2 + (8 - 2)^2)

Distance = √((-5)^2 + 6^2)

Distance = √(25 + 36)

Distance = √61

The square root of 61 is approximately 7.8 which rounded to the nearest tenth is 7.8.

Therefore, The distance between the given set of points is 7.8 units.

To know more about the distance formula refer to:

brainly.com/question/28956738

#SPJ4

Answer:

Lauren has 44 watermelons

Step-by-step explanation:

Let us use W to denote the number of watermelons and O to denote the number of oranges

We have

W:O = 88:14

This can be represented as a fraction:

[tex]\dfrac{W}{O} = \dfrac{88}{14}[/tex]

Divide numerator and denominator of  [tex]\dfrac{88}{14}[/tex]  by 2

[tex]\dfrac{88 \div 2}{14 \div 2} = \dfrac{44}{7}\\\\\\\\\mathrm{So\; \dfrac{W}{O} = \dfrac{44}{7}}\\\\[/tex]

This means for every 7 oranges there are 44 times that number of watermelons

Since we are given that there are 7 oranges she should have 44 watermelons

Another way of looking at this is from the relation

[tex]\dfrac{W}{O} = \dfrac{44}{7}}\\\\[/tex]

Putting in O = 7 we get

[tex]\dfrac{W}{7} = \dfrac{44}{7}\\\\[/tex]

Since the denominators are the same the numerators must be the same i.e. W = 44

Lauren has 44 watermelons

1 in 4 angle of slope in degree is 90°.

In mathematics, a line's slope, also known as its gradient, is a numerical representation of the line's steepness and direction.

An angle is a shape created by two rays that share a terminus and are referred to as the angle's sides and vertices, respectively. Angles created by two rays are in the plane where the rays are located.

The inverse tangent function is called arctangent, often known as arctan or tan-1. Tangent only has a limited domain for its inverse function.

So to find the 1 in 3 angle we have to put the value 1/3 in arctan function

which is tan inverse function.

Learn more about Angle:

brainly.com/question/30239691

#SPJ4

Account B has more money than account A. Then account that has the greater principal will be account B.

Simple interest is the concept that is used in many companies such as banking, finance, automobile, and so on.

The formula for interest is written as,

I = (PRT)/100

Where P is the principal, R is the rate of interest, and T is the time.

Dakota procured $10.50 in revenue in Record An and $35.00 in revenue in Record B following 21 months. In the event that the straightforward financing cost is 3% for Record An and 5% for Record B.

Then the account has the greater principal will be given as,

10.50 = [P₁ x 3 x (21/12)] / 100

1050 = 5.25P₁

P₁ = $200

35 = [P₂ x 5 x (21/12)] / 100

3500 = 8.75P₂

P₂ = $400

Account B has more money than account A. Then account that has the greater principal will be account B.

More about the simple interest link is given below.

https://brainly.com/question/2793278

#SPJ1

Answer:

87cm²

Step-by-step explanation:

surface area =l×w all round since there is no square, we begin with the first part

6×3×2=36

3×2×2=12

6×2×2=24

4×1×2=

3×1×2=

1×1=1

Then add them all =87cm²

The dimensions of the cylinder are -

{r} = √500/πh

{h} = (500/r²)

Given is the volume of the cylinder as -

V = 500 cm³

We can write -

V = 500

So, we can write -

πr²h = 500

So, we can write -

{r} = √500/πh

{h} = (500/r²)

Therefore, the dimensions of the cylinder are -

{r} = √500/πh

{h} = (500/r²)

To solve more questions on algebraic expressions, visit the link below-

brainly.com/question/1041084

#SPJ1

{Question in english -

What are the measurements of a cylinder (height, radius) if its volume is 500 cm3}

To simplify 9x, you need to use the distributive property.

The distributive property states that when you multiply a number by a group of numbers or variables, you can separate the group into individual components, multiply each component by the number, and then add the products together.

For example, 9x can be simplified as follows:

9x = 9x(1)

Using the distributive property, you can separate the 1 into individual components:

9x = 9x(1) = 9x(1 + 0)

Then, you multiply each component by the number:

9x = 9x(1) = 9x(1 + 0) = 9x(1) + 9x(0)

And finally, you add the products together:

9x = 9x(1) + 9x(0) = 9x + 0

Therefore, 9x can be simplified to 9x.

To know more about Simplification visit:

https://brainly.com/question/2804192

#SPJ4

The three (3) statements which are true include the following:

A. The radius of the circle is 3 units.

B. The center of the circle lies on the x-axis.

D. The radius of this circle is the same as the radius of the circle whose equation is x² + y² = 9.

In Mathematics, the standard form of the equation of a circle is represented by this mathematical expression;

(x - h)² + (y - k)² = r²   ....equation 1.

Where:

From the information provided above, we have the following equation of a circle:

x² + y² – 2x – 8 = 0      ......equation 2.

In order to determine the true statements, we would rewrite the equation in standard form and then factorize by using completing the square method:

x² – 2x + y² = 8 = 0

x² – 2x + (2/2)² + y² = 8 + (2/2)²

x² – 2x + 1 + y² = 8 + 1

(x – 1)² + (y - 0)² = 9         .......equation 3.

Comparing equation 1 and equation 3, we have the following:

Center (h, k) = (1, 0)

Radius (r) = 3

Additionally, this line and the center of the given circle lies on the x-axis (x-coordinate) because the y-value is equal to zero (0).

(x – 0)² + (y - 0)² = 3²

x² + y² = 9.

Read more on equation of a circle here: brainly.com/question/17028215

#SPJ1

Answer:

8 ft

Step-by-step explanation:

Area of a circle is given by πr² where r is the radius

Here we are given the area A and asked to find the radius

We have Area :
πr² = 64π

Dividing by π on both sides we get
r² = 64

r = ±√64

r = ±8

We can ignore negative values for radius and state that

r = 8 ft

The mirror image of the coordinates is (4, - 20)

The term coordinates is defined are ordered pairs of points that help us locate any point in a 2D plane or 3D space.

Here we have given the coordinates (4, 20).

And we need to find the mirror image of given coordinates.

As per the definition of coordinates the rule of Mirror image of (x , y ) in the x - axis is  written ( x , -y).

Here we have the value of x as 4 and the value of y as 20.

When we apply the rule on the given coordinates then we get the resulting points,

=> (4, 20) = (4, - 20)

Complete Question:

What is the mirror image of the coordinate (4,20)?

To know more about coordinates here.

https://brainly.com/question/27749090

#SPJ4

Evaluating the exponential equation:

y = (1/3)*4^x

on x = 3/2 gives y = 8/3.

Here we have the following exponential equation:

y = (1/3)*4^x

And we want to evaluate it on x = 3/2, to do so, we just need to replace the variable on the equation by the given number.

We will get:

y = (1/3)*4^(3/2)

The power part can be rewrite as:

y = (1/3)*√4^3

y = (1/3)*2^3

y = (1/3)*8 = 8/3

That is the value of the equation when evaluated on x = 3/2.

Learn more about exponential equations at:

https://brainly.com/question/11832081

#SPJ1

The values of composite functions are,

(w о u)(2) = √7 + 2

(u о w)(2) = 9 + 4√2

Function composition is an operation о used in mathematics that takes two functions, f and g, and creates a function, h = g о f, such that h(x) = g. The function g is applied in this operation to the outcome of applying the function f to x.

Given:

u(x) = x^2 + 3

w(x) = √x+2

We have to find (w о u)(2) and (u о w)(2).

First to find (w о u)(x)

(w о u) = w(u(x))

         = w(x^2 + 3)

(w о u) = √(x^2 + 3) + 2

(w о u)(2) = √(2^2 + 3) + 2

 (w о u)(2) = √7 + 2

Now to find (u о w).

(u о w)(x) = u(w(x))

= u(√x+2)

= (√x+2)^2 + 3

= x + 4√x + 4 + 3

(u о w)(x) = x +  4√x + 7

(u о w)(2)  = 2 + 4√2 + 7

 (u о w)(2)  = 9 + 4√2

Hence,

The values of composite functions are,

(w о u)(2) = √7 + 2

(u о w)(2)  = 9 + 4√2

To learn more about composite function refers to;

brainly.com/question/29862832

#SPJ1