please let me know if these are right or wrong!! 20 points!!

Answer:

Step-by-step explanation:

A+B= we will add both expressions

A+B=3x^4+2x^2-2x+1-2x^3+4x^2-3  we will add like terms

A+B= 3x^4-2x^3+6x^2-2x-2

A-B=3x^4+2x^2-2x+1-(-2x^3+4x^2-3)

A-B=3x^4+2x^2-2x+1+2x^3-4x^2+3

A-B=3x^4+2x^3-2x^2-2x+4

Answer:

it shows the unit rate of the graph per hour.

Step-by-step explanation:

The set of input (argument) values for which a function is defined is domain.

The set of values (points) which a function can obtain is range.

Answer: Plus or minus 1 standard deviation from the mean.

Step-by-step explanation:

According to the Empirical rule,

If the population is normally distributed then, about 68% of the population lies within 1 standard deviation from the mean value.

Here, the data shows 68% percent of the area under the normal  distribution.

This is equivalent to "plus or minus 1 standard deviation from the mean."

Hence, the correct option is : plus or minus 1 standard deviation from the mean.

Answer:

the correct answer is C. 75°

The value of ∠R = 75⁰

The measurements of the sides and angles of two or more triangles determine whether they are congruent. A triangle's size is determined by its three sides, and its shape is determined by its three angles. If the pairs of their corresponding sides and angles are equal, two triangles are said to be congruent.

Given ΔQRS ≅ ΔXYZ

for congruency the sides and angle of both the triangles should be equal so for  ΔQRS and ΔXYZ ; QR = XY, QS = XZ, and RS = YZ and

∠Q = ∠X, ∠S = ∠Z and ∠R = ∠Y

from figure ∠Q = ∠X = 55⁰, ∠S = ∠Z  = 50⁰

sum of angle of triangle is 180⁰,

∠Q + ∠S + ∠R = 180⁰

∠R  = 180 - 55 - 50

∠R  = 75⁰

Hence ∠R  = 75⁰

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Answer:

Step-by-step explanation:

Substitute 3x into y=-4x-49

y=−4x−49

3x=−4x−49

3x+4x=−4x−49+4x(Add 4x to both sides)

7x/7=−49/7

(Divide both sides by 7)

x=−7

Step: Substitute−7forxiny=3x:

y=3x

y=(3)(−7)

y=−21(Simplify both sides of the equation)

Answer:

x=−7 and y=−21

The solution set to the given system of equation is (- 7, - 21).

Given are the system of equations as follows -

y = 3x

y = - 4x - 49

We have the equations as -

y = 3x             .... Eq [1]

y = - 4x - 49     .... Eq [2]

Now, we can write the equation [2] as -

3x = - 4x - 49

7x = -49

x = - 7

So, we can find the value of [y] as -

y = 3x

y = 3 x - 7

y = - 21

Therefore, the solution set to the given system of equation is (- 7, - 21).

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Answer:

it goes in this order

false

true

false

true

The answers are as follow:

a) False

b) True

c) False

d) True

A system of writing numbers is known as a number system. It is the mathematical notation for consistently employing digits or other symbols to represent the numbers in a particular set. It represents the arithmetic and algebraic structure of the numbers and gives each number a distinct representation.

Given:

a) 18 is 3 more than 9.

But, 3 more than 9.= 12

So, it is false

b) 18 is 3 times as much as 6.

= 3 x 6

= 18

So, it is true

c) 19 is 3 times as much as 27.

= 3 x 27

= 81

So, it is false

d) 9 is 3 more than 6

= 3+6

= 9

So, it is true

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Answer:

I need a picture of the prism, then I will answer the question.

Step-by-step explanation:

Answer:

442

Step-by-step explanation:

Answer:Number 1 .is 33 because its the nearest number

number 2. is 3 dollars a pound s

number 3. she would take 22 minutes to walk 3.3 miles

number 4 he would drive 166 miles  plz brainliest plz

Step-by-step explanation:

1.

296÷8=37

2.

15.98÷2=7.99 per pound

7.99x3=23.97

3.

3.5÷0.5=7 times as many

11x7=77 minutes or 1 hour 17 minutes

4.

500÷8=62.5  per hour

62.5x3=187.5

Answer:

y = (x - 1)²

Step-by-step explanation:

A parabola is the locus of a point such that its distance from a fixed point (known as the focus) and a fixed line (known as the directrix) is always constant. The equation of a parabola is a quadratic equation.

The equation of a parabola with a horizontal directrix is given by:

(x - h)² = 4p(y - k).

Where the directrix (y) = k - p, vertex = (h, k)

Given that:  Vertex (1,0) and the Directrix y = -¼, Therefore:

vertex = (h, k) = (1, 0). h = 1 and k = 0.

y = k - p

but y = -1/4. Hence:

-1/4 = k - p

p = k + 1/4

p = 0 + 1/4

p = 1/4

Since the equation of the parabola is:

(x - h)² = 4p(y - k).

Substituting:

(x - 1)² = 4(1/4)(y - 0)

(x - 1)² = y

y = (x - 1)²

y = x² - 2x + 1

Answer:

(d-3)/2

Step-by-step explanation:

Given:

A number "d" Subtract by 3

So,

⇒ (d-3)

Product is divided by 2

So,

⇒ (d-3)/2

-13 < 3x – 7 < 5

Add 7 to all 3 terms;

-6 <3x<12

Divide all 3 terms by 3:

-2<x<4

Answer:

option a x²-25

Step-by-step explanation:

(x-5)²

x²-25

Answer:

y = -3x + 8.3

Step-by-step explanation:

You need to rearrange 9x + 3y = 22 in the form y = mx +c.

9x+3y = 22

3y = -9x +22

y = -3x + 7.3

As long as the gradient is the same, the lines will be parallel. So you can give any number to the intercept (in this case I gave 8.3) and you will have parallel equations.

Answer:

1/2 is the answer

step-by-step explqnation:

Answer:

The answer is 1/2.

Answer: 4 BTUs/ft^3

Step-by-step explanation:

i just did a test and this was the right answer

Answer:

Correct answers are A,D and F

Step-by-step explanation:

Answer:

5(6a+5)

Step-by-step explanation:

Answer:

the trip would be 800 miles all together

Step-by-step explanation:

if you divide 240/3 it is 80 which means that 80 miles is 10% of the trip so you can multiply 80 by 10 to see that 800 miles is 100% of the trip.

Answer:

true

Step-by-step explanation: In a concave polygon, each interior angle is less than 180°.

Answer:

Diagonal = hypotenuse. Approximately 30.8 inches to the nearest tenth.

Step-by-step explanation:

Answer:

112 is the answer

Step-by-step explanation:

to find the value of x, you need to add both the numbers 34 and 78 to find x.

Answer:

x=112

Step-by-step explanation:

x=78+34

(here the 34 passes to the other side, and because it is substracing, you pass it adding)

x=112

May have rained 2.5 more inches then in April. First you would need to subtract 9.4 because that’s how much it rained in May and then subtract it with 6.9 because that’s how much it rained in April. Then you get the answer of 2.5. You didn’t have to subtract the March  because they didn’t ask you for the inches for the March.

Answer:

Area of circle = 113.04 square feet

Step-by-step explanation:

Explanation:-

Given that radius of the circle (r) = 6 feet

Area of circle

                   A = π r²

                   A =  π (6)²

                  A =  36 π

                  A = 36 × 3.14

                  A = 113.04 square feet

r = 5.8 cm r = 7.1 cm

d = 11.6 cm d = 14.2 cm

C = 36.44 cm C = 44.611 cm

A = 105.68 cm2 A = 158.37 cm2

( I can't find where square is )