NEED NOW!! WILL GIVE BRAINLIEST + 100 POINTS.

If a math test is worth 100 points and has 30 problems and  each problem is worth either 3 or 4 points, then there are 10 4 point problems

Total number of questions = 30

Number of 3 point questions = x

Number of 4 point questions = y

The first equation will be

x + y = 30

x = 30-y

Total score of the test = 100 points

Then the second equation will be

3x + 4y = 100

Here we have to use the substitution method, substitute the value of x in the equation

3(30-y) + 4y = 100

90 - 3y +4y = 100

y = 100 - 90

y  = 10

Hence, if a math test is worth 100 points and has 30 problems and  each problem is worth either 3 or 4 points, then there are 10 4 point problems

Learn more about substitution method here

brainly.com/question/14619835

#SPJ4

Answer: 5.61333333 h

If the length between Garden city to dodge city is 84.2km the answer would be 5.61333333 hours [non-terminating decimal]

Step-by-step explanation:

So ummm, i dunno if the answer is right but yeahh

1h = 15 miles

Distance between GC AND DC = 84.2

84.2 * 15 = 5.6133333

Segment BC  is congruent to segment EF,

Angle BAC  is congruent to angle EDF,

Angle CBA is congruent to angle DEF.

Given:

Triangle ABC is congruent to triangle DEF.

if two triangles are congruent:

congruent sides are:

AB ↔ DE ,BC↔EF, CA ↔ FD

congruent angles are:

<A ↔ <D , <B ↔ <E, <C ↔ <F.

Therefore Segment BC  is congruent to segment EF, Angle BAC  is congruent to angle EDF, Angle CBA is congruent to angle DEF are correct.

Learn more about the triangles here:

https://brainly.com/question/2773823

#SPJ1

40 percentage of 75 is 30 and 2/5 of 75 is 30. So, Priya calculated in a correct way.

Given,

To find 40% of 75, Priya calculates 2/5 of 75

We have to find the value of 40% of 75.

Percentage;

A value or ratio that may be stated as a fraction of 100 is referred to as a percentage in mathematics. If we need to calculate a percentage of a number, we should divide it by its entirety and then multiply it by 100. The proportion therefore refers to a component per hundred. Per 100 is what the word percent means. The sign "%" is used to denote it.

Now,

Lets find;

40% of 75

40/100 × 75 = 40/4 × 3 = 10 × 3 = 30

That is,

40% of 75 is 30.

Now,

2/5 of 75

2/5 × 75 = 2 × 15 = 30

That is,

2/5 of 75 is also 30

Therefore,

40 percentage of 75 is 30 and 2/5 of 75 is 30. So, Priya calculated in a correct way

Learn more about percentage here;

https://brainly.com/question/11886240

#SPJ1

Answer:

x -2x and the y is -2y

Step-by-step explanation:

Amina has a bag of 6 black balls and 4 green balls. Hamad has a bag of 3 black balls and 5 green balls. If one ball is drawn from each bag, the probability that one is black and one is green is 0.525.

Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely is that a proposition is true.

Amina has a bag of 6 black balls (B1) and 4 green balls (G1).

Hamad has a bag of 3 black balls (B2) and 5 green balls (G2).

∴ Probability of getting one black and one green ball

           ​ = B1G2 + G1B2

            = 6/10 × 5/8 + 4/10 × 3/8

            =  30/80 + 12/80

             =  0.525

If one ball is drawn from each bag, the probability of getting one black and one green ball is 0.525.

To know more about probability:

https://brainly.com/question/17239706

The probability of getting one black and one green ball if one ball is drawn from each bag is 0.525.

Probability is defined as the possibility of an event being equal to the ratio of the number of favorable outcomes and the total number of outcomes.

Amina has 6 black balls and 4 green balls in her bag. Hamad has three black balls and five green balls in his bag.

Amina has 6 black balls (B1) and 4 green balls in her bag (G1).

Hamad has 3 black balls (B2) and 5 green balls in his bag (G2).

So, the probability of receiving one black and one green ball:

          ​ = B1G2 + G1B2

           = 6/10 × 5/8 + 4/10 × 3/8

           =  30/80 + 12/80

           =  0.525

Therefore, the required probability is 0.525 that one is black and one is green.

Learn more about probability here:

brainly.com/question/11234923

#SPJ2

Yes ordered pair (-4,5 ) is a solution to this linear equation

What is linear equation?

If an equation is expressed as axe + by + c=0, where a, b, and c are real integers and x and y's coefficients, it is said to be a linear equation in two variables.

Main body:

According to question:

y = -2x-3

point = (-4,5)

so as to find whether this point satisfies the equation or not, we need to put the value of any variable and check whether other value holds true or not.

Now substituting x= -4 in the given equation

⇒ y = -2(-4) -3

⇒y 8-3

⇒y= 5

which is given in the ordered pair

hence (-4,5) are a solution to this equation.

To learn more about linear equation click on the link below

https://brainly.com/question/12788590

#SPJ9

Answer: 3

Step-by-step explanation: The dot or the point/exponent lands on 3/1 simplifying as 3

The lengths of the sides AN, PM, and MO of the given polygons are 26, 40, and 96, respectively.

We are given two triangles. The vertices of the first triangle are A, N, and T. The vertices of the second triangle are P, O, and M. Both the triangles are right-angled. The triangles are similar to each other. The lengths of the sides AT and TN are 10 and 24, respectively. We will use the Pythagorean theorem to find the length of side AN.

AN = √[(10)² + (24)²] = √(100 + 576] = √676 = 26

Now, as we know the triangles are similar, the lengths of the corresponding sides must be in the same proportion. The ratio is calculated as given below.

r = PO/AN = 104/26 = 4

The length of the side PM is equal to r*AT = 4*10 = 40. The length of the side MO is equal to r*TN = 4*24 = 96.

To learn more about polygons, visit :

https://brainly.com/question/24464711

#SPJ1

Answer:

12

Step-by-step explanation:

1) Substitute x into the equation

To substitute you would need to multiply the number before it by 2 (in other questions it would be the value told that is x)

2) Put the numbers you have worked out into the equation

-6 + 1.5 + 5 - 4.5 + 16

3) Work out the final equation

Hope this helps, have a great day!

(a) The function "f" is increasing for the x-values of [(-∞) < x ≤ 0] and            [2 < x < ∞], while "f" is decreasing for the x-values of [0 < x ≤ 2].

(b) The function f(x) is greater than 0 at [(-1) < x < ∞], excluding the point  (x = 2)

(c) The function f(x) is less than 0 when [x < (-1)]

In the reference attachment attached along with the question statement, we are provided with a graph of a certain function "f",

And as per the question statement, we are required to determine the x-values for the following:

(a) for which "f" is increasing or decreasing,

(b) [f(x) > 0]

(c) [f(x) < 0]

From the graph, it is very clear that, the slope is rising from [(-∞) < x ≤ 0] and [2 < x < ∞], while, declining from [0 < x ≤ 2] of the x-axis. Therefore,

(a) The function "f" is increasing for the x-values of [(-∞) < x ≤ 0] and            [2 < x < ∞], while "f" is decreasing for the x-values of [0 < x ≤ 2].

(b) The function f(x) is greater than 0 at [(-1) < x < ∞], excluding the point  (x = 2)

(c) The function f(x) is less than 0 when [x < (-1)]

To learn more about x-values of increasing or decreasing functions, click on the link below.

https://brainly.com/question/28912753

#SPJ1

Therefore, the transformation of the double integral can be expressed as follows: ∫∫g(x', y') (x' + 1)(y' - 1) dx' dy' = ∫∫g(x', y') (x' + 1)(y' - 1) |J| dA'

the alteration of variables A mathematical trick known as a formula is used to switch the variables in an integral from one set of variables to another. The integral is frequently simplified or made easier to solve by doing this. Given a function f(x) and two sets of variables x and y, the integral of f(x) with respect to x may be represented as the integral of a transformed function g(y) with respect to y, where g(y) is connected to f(x) by a functional connection between x and y. For instance, the integral of f(x) with respect to x can be expressed as the integral of f(sqrt(y)) with respect to y if x and y are connected by the equation y = x2.

How to solve?

x' = x - 1

y' = y + 1

∫∫g(x, y) xy dA = ∫∫g(x', y') (x' + 1)(y' - 1) dx' dy'

∫∫f(x, y) dA = ∫∫f(x', y') |J| dA'

|J| = | ∂x'/∂x ∂x'/∂y |

| ∂y'/∂x ∂y'/∂y |

|J| = | 1 0 |

| 1 1 |

Therefore, the transformed double integral can be expressed as follows:

∫∫g(x', y') (x' + 1)(y' - 1) dx' dy' = ∫∫g(x', y') (x' + 1)(y' - 1) |J| dA'

To learn more about the change of variables formula, visit:

https://brainly.com/question/14852967

#SPJ4

Answer:

x = 6.928   [tex]x = 0.072[/tex]

Step-by-step explanation:

Use the quadratic formula

[tex]\frac{-b(+-)\sqrt{b^{2 } -4ac} }{2a}[/tex]

[tex]a = 2\\b = -14\\c = 1[/tex]

[tex]\frac{-(-14)(+-)\sqrt{(-14)^{2 } -4(2)(1)} }{2(2)}[/tex]

[tex]\frac{-(-14)(+-)\sqrt{196 -8} }{4}[/tex]

[tex]\frac{14+\sqrt{188} }{4}[/tex]     [tex]\frac{14-\sqrt{188} }{4}[/tex]

[tex]x = 6.928[/tex]  [tex]x = 0.072[/tex]

The  equation of the regression line is  [tex]\bar{y}[/tex]=9.1006+(-0.2157)x and the point prediction of ammonium concentration for 25ml/h is  [tex]\bar{y}[/tex]=3.7081

A regression line is an approximation of the line that describes the true, but unknown, linear connection between two variables. The regression line equation is used to predict (or estimate) the value of the response variable from a given value of the explanatory variable.

In statistical modeling, regression analysis is a collection of statistical techniques for estimating the associations between a dependent variable and one or more independent variables.

a) [tex]\bar{y}[/tex]=β₀+β₁x

Where,

β₁=[tex]S_{xy}[/tex]/[tex]S_{xx}[/tex] -------(1)

Where,

[tex]S_{xy}[/tex]= -341.959231

[tex]S_{xx}[/tex]1585.230769

By substituting these values in equation 1 we get,

β₁= -0.2157

β₀= [tex]\bar{y}[/tex]-β₁x

Where,

[tex]\bar{y}[/tex]=∑[tex]y_{i}[/tex]/n

∑[tex]y_{i}[/tex]=52.8

n=13

Then,

[tex]\bar{y}[/tex]=4.0615

[tex]\bar{x}[/tex]=∑[tex]x_{i}[/tex]/n

∑[tex]x_{i}[/tex]=303.7

n=13

[tex]\bar{x}[/tex]=23.3615

β₀=4.0615-(-0.2157)(23.3615)

=9.1006

Therefore, β₀=9.1006

The regression equation is  [tex]\bar{y}[/tex]=9.1006+(-0.2157)x

If x=25,

[tex]\bar{y}[/tex]=9.1006+(-0.2157)(25)

[tex]\bar{y}[/tex]=3.7081

To know more about regression line, visit:

https://brainly.com/question/7656407

#SPJ4

The conversion is 0.785 radian = 141.3 degree.

The same attribute is expressed using a unit conversion, but in a different unit of measurement. For instance, time can be expressed in minutes rather than hours, and distance can be expressed in kilometres, feet, or any other measurement unit instead of miles.

A conversion factor is a value or a number that is used to multiply or divide one set of units into another.

Given:

We have to convert 0.785 rad to pi format.

As, we know Radians = Degrees × π/180'

and, 0.785 rad = 0.785 x 180

                        = 141.3 Degree

Hence, the conversion is 0.785 radian = 141.3 degree.

Learn more about unit conversion here:

https://brainly.com/question/4736731

#SPJ1

The parabola has a vertex at (-3, -2), has a p-value of 3 and it opens up.

Mathematically, the vertex form of a parabola is represented by this mathematical expression:

y = a(x - h)² + k

Where:

h and k represents the vertex of the equation.

In Mathematics, the focus for either a right or left parabola is modeled by this mathematical expression (h + p, k) while its directrix is modeled by this mathematical expression x = h - p;

h + p = 0   ⇒ h = -p

h - p = -6

Solving the set of linear equations simultaneously, we have:

-p - p = -6

-2p = -6

p = 6/2

p = 3

For the value of h, we have:

h = -3.

Additionally, the vertex form of this parabola is given by:

y = a(x - h)² + k

y = a(x - 3)² - 2

Read more on parabola here: brainly.com/question/27814369

#SPJ1

Complete Question:

A parabola can be drawn given a focus of (0, −2) and a directrix of x = −6. What can be said about the parabola?

The parabola has a vertex at ( , ), has a p-value of

and it

-opens up

-opens down

-opens right

-opens left

Answer:

Below

Step-by-step explanation:

m = slope

Use two points on the graph to find  m

    m = ( x1-x2)/(y1-y2)  = ( 1- -1) / ( -4 - -2) =  2 / -2 = -1

Perpindicular slope is   - 1/m   =   -1 / (-1) = 1

Answer:

all of them are right answers

[tex]x = \frac{24}{23 \\ } [/tex]

or

[tex]x = 1.04[/tex]

or

[tex]x = 1 \frac{1}{23} [/tex]

Answer:

$91.92

Step-by-step explanation:

1/2 lb of shrimp is 11.49 how much for 4lb?

1/2 pounds = 0.5 pounds

4lb/0.5lb = 8

11.49 * 8 = $91.92

The measure of the angle is 39°.

Complementary angles are angles whose sum is equivalent to 90°. On the other hand, supplementary angles are angles whose sum is equivalent to 180°.

Let x be the measure of the angle.

90° - x = complement angle of x

180° - x = supplement angle of x

If the measure of its supplement is 39 more than twice the measure of its complement, then

180° - x = 39 + 2(90° - x)

Simplify and solve for x.

180° - x = 39 + 2(90° - x)

180° - x = 39 + 180° - 2x

x = 39°

Hence, the measure of the angle is 39°.

Learn more about complementary angles here: https://brainly.com/question/16220339

#SPJ4

By definition, we can complete the two sentences as follows:

A general function can be written as:

y = f(x).

This function "f" takes inputs "x" and transforms them into the outputs "y".

And by definition, the set of all the inputs x is called the domain of the function, while the set of all outputs is called the range of the function.

So the two complete sentences are:

The collection of all input values is the domain of the function.

The collection of all output values is the range of the function.

Laern more about functions:

https://brainly.com/question/2328150

#SPJ1

The number of students studying abroad in 2001 is 150.38 thousand

The number of students studying abroad in 2018 is 467.53 thousand

The given equation is known as an exponential equation. An exponential equation is a non-linear equation.

The given exponential equation is 123.1(1.069)^x

Where:

Number of students studying abroad in 2001 = 123.1(1.069)^3= 150.38 thousand

Where x = 2001 - 1998 - 3

Number of students studying abroad in 2018 = 123.1(1.069)^20 = 467.53 thousand

Where x = 2018 - 1998 = 20

To learn more about exponential functions, please check: brainly.com/question/26331578

#SPJ1

8) A system of two equations that could be used to find out the price of package A and package B are;

C = 150 + 55h

C = 210 + 40h

9) The number of nights  Kareem would need to stay in a hotel to pay the same amount for either vacation package is; 4 nights

We are told that Kareem is going to Florida and the cost for two different vacation packages is;

Package A

Roundtrip Airfare Cost = $150

Hotel Cost (per night) = $55

Package B;

Roundtrip Airfare Cost = $210

Hotel Cost (per night) = $40

A) Now, if  h represents Hotel Cost and C represents Cost of package, then we have;

For package A;

C = 150 + 55h   ------(1)

For package B;

C = 210 + 40h    ------(2)

9) The number of nights  Kareem would need to stay in a hotel to pay the same amount for either vacation package is;

150 + 55h = 210 + 40h

210 - 150 = 55h - 40h

60 = 15h

h = 60/15

h = 4

Read more about simultaneous equations at; https://brainly.com/question/148035

#SPJ1

Answer:

x=-4

Step-by-step explanation:

y=mx+b is slope intercept form where m is slope and b is y intercept

To find slope we use y2-y1/x2-x1

5-9/-4-(-4)

-4/0

The slope is undefined

But we can write this as x=-4 since it is a vertical line going straight up

Hopes this helps please mark brainliest

In order to solve for the variable in the equation 2 (4 x 3) 4 = 3 x minus (2 x 4), giovanni first applies the distributive property.

The equation is a result is 8x+6+4 = 3x-2x-4.

Given that the distributive property is to multiplying by the numbers outside of the parentheses into the inside of the parentheses

So we now that,

2×4x=8x

2×3=6

8x+6+4

Then do the same thing on the other side also so that Which we gets is equal to the below

3x-2x-4

so the equation we get is

8x+6+4 = 3x-2x-4

Hence the answer is, we get the equation is a result is 8x+6+4 = 3x-2x-4

To learn more about distributive property click here https://brainly.com/question/28244772

#SPJ4

On average, Logan drinks (2)/(3) of a 6-ounce glass of water in 1(4)/(5) hours. How much water does he drink, in glasses per hour? Enter your answer as a whole number, proper fraction, or mixed number in simplest form.

The following response has been constructed in a straightforward, step-by-step approach.

Measure: 1 ounce

2/3×6 =4 glass

Considering that a person consumes four glasses every hour.

he Drinks x glasses after one hour.

Reason: Since 21/5x=4,

21x=5×4

Glass 21x=20x=20/21

Answer: So, consume 20/21 glasses in an hour.

The response is a correct fraction.

To know more about fractions, visit;

https://brainly.com/question/10354322

#SPJ9

The slope of the points (15,-6) and (-4,11) is  0.895.

The slope of a line is the ratio of the amount that y increases as x increases some amount.

To calculate the slope of the two points given, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the slope of the points is 0.895.

Learn more about slope here: https://brainly.com/question/3493733

#SPJ1

Answer:

Horizontal: y=-8

Vertical: x=-3

Step-by-step explanation:

Answer:

x = - 3 and y = - 8

Step-by-step explanation:

the equation of a vertical line parallel to the y- axis is

x = c ( c is the value of the x- coordinates the line passes through )

the line passes through (- 3, - 8 ) with x- coordinate - 3 , then

x = - 3 ← equation of vertical line

the equation of a horizontal line parallel to the x- axis is

y = c ( c is the value of the y- coordinates the line passes through )

the line passes through (- 3, - 8 ) with y- coordinate - 8 , then

y = - 8 ← equation of horizontal line

The largest volume that the box  can have is 02.

equation for volume :

v = x (3- 2x)²

Differentiating using chain rule and product line:

    v' = 1(3 - 2x)² + 2x (3 -2x) (-2)

        = 9 - 12x + 4x² -12x +8x²

        = 9 - 24x +12x²

Finding the critical value where v' = 0

 v' = 0

⇒12x² - 24x +9 =0

⇒3 ( 4x² -8x +3)=0

⇒ 4x² -8x+3 =0

(2x- 3) (2x-1) =0

or, x=3/2 or 1/2

putting the value x= 1/2, we get,

 V = 2

Learn more about volume :

https://brainly.com/question/22907480

#SPJ4