Simplify: (4x2 + 21xy – 7y2) + (10x2 + 11y2 – 20).
HELP PLEASEEE

Answer:20

Step-by-step explanation:

y=1/2x+10

1/2x=y-10

x=2y-20

y=2x-20

Answer:   25d  = 1,500

Step-by-step explanation:  i have no explanation, sorry if you need one i will work it out but if you just need the anwser, there it is .

Answer:

ill assume you're asking the answer for 1 hour

Step-by-step explanation:

multiply each side by 4. then, 12/4(3)=1

so 3 square feet and hour

Answer:

y = -2x +3

Step-by-step explanation:

Parallel lines always have the same slope

To insert the point, use the slope intercept formula: y =mx+b

insert y (9)

insert x (-3)

insert the slope -2

9 = (-2)(-3) + b

9 = 6+b

subtract 6 from both sides

3 = b

Answer:

The first choice

Step-by-step explanation:

It says that its decreasing so the slope is negative.

It also starts of with 565 so that's the y intercept

Answer:

30% of $110 equals $33.

Answer:

Option B

Step-by-step explanation:

8 - 2x < 18

Subtract 8 from both sides;

-2x < 10

Divide both sides by -2

x > -5

Answer:

X > -5

it would be B.

open circle on -5 and the arrow point on the right. Because x can be any number greater than -5.

Step-by-step explanation:

8 - 2x < 18

- 2x < 18 - 8

-2x < 10

x > 10/-2

x > -5

Answer:

Hope this helps!!! :)

Step-by-step explanation:

#1: if there is buy 1 get 1 free, then buy 6 get 3 free. so 2.8 times 3 = $8.4

#2: 4 for $3. break it up to 1 for $0.75. now 0.75 times 6 = $4.5

#3: the second one. $4.5 < $8.4

#4: 45 times 12 = $54

Answer:

76.8%

Step-by-step explanation:

All you have to do is multiply the decimal by 100.

Answer:

76.8%

Step-by-step explanation:

I just did a thing and got the answer -v-

Answer:

3 inches

Step-by-step explanation:

If the dog chews off 4 inches every day, you first have to multiply the inches by the number of days, which in this case is 3 x 4, which equals 12. In 3 days, he chewed off 12 of the original 15 inches, leaving only 3 inches left.

Answer:

252 cm²

Step-by-step explanation:

Find AB:

AB² = 41² - 40²

AB² = 81

AB = √81

AB = 9 cm

Area of the trapezium = ½(a + b) × h

Where,

a = 16 cm

b = 40 cm

h = 9 cm

Area = ½(16 + 40) × 9

Area = ½(56)×9

Area = 252 cm²

Reduce by cancelling the common factors.

(13)x−1=27 Convert the exponential equation to a logarithmic equation using the logarithm base (13) of the right side (27)  equals the exponent (x−1)log13(27)=x−1

Answer:

Again...

Step-by-step explanation:

Answer:

The answer is A. y =32x + 15

Step-by-step explanation:

The reason behind this is the rate. The amount of money each month is the slope (m). The additional fee would be the b.

Answer:

Step-by-step explanation:

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

Original price  = c

Markup = 25%

Markup price is:

Correct option is C

Answer:

B

Step-by-step explanation:

Divide by pir^2 to get h all by itself and you'll have V/pir^2 = h

[tex]\sf{\bold{\green{\underline{\underline{Given}}}}} [/tex]

⠀⠀⠀⠀

______________________

[tex]\sf{\bold{\green{\underline{\underline{To\:Find}}}}} [/tex]

⠀⠀⠀⠀

______________________

[tex]\sf{\bold{\green{\underline{\underline{Solution}}}}} [/tex]

⠀⠀⠀⠀

V = π r² h

⠀⠀⠀⠀

⠀⠀⠀⠀

[tex]\sf \dfrac{V}{\pi} = r² h [/tex]

⠀⠀⠀⠀

[tex]\sf \dfrac{V}{\pi\times r^2} = h [/tex]

⠀⠀⠀⠀

⠀⠀⠀⠀

Option 1 :

⠀⠀⠀⠀

[tex]\sf \bigg( h = \dfrac{V}{\pi r^2} \bigg) \neq ( h = V - \pi r^2) [/tex]

⠀⠀⠀⠀

This option is not correct

⠀⠀⠀⠀

Option 2 :

⠀⠀⠀⠀

[tex]\sf \bigg( h = \dfrac{V}{\pi r^2} \bigg) [/tex] = [tex]\sf \bigg( h = \dfrac{V}{\pi \times r^2} \bigg) [/tex]

⠀⠀⠀⠀

This option is correct

⠀⠀⠀⠀

Option 3 :

⠀⠀⠀⠀

[tex]\sf \bigg( h = \dfrac{V}{\pi \times r^2} \bigg) \neq ( h = V\pi r² ) [/tex]

⠀⠀⠀⠀

This option is not correct

⠀⠀⠀⠀

Option 4 :

⠀⠀⠀⠀

[tex]\sf \bigg( h = \dfrac{V}{\pi \times r^2} \bigg) \neq ( h = V - \pi - r^2) [/tex]

⠀⠀⠀⠀

This option is not correct

______________________

[tex]\sf{\bold{\green{\underline{\underline{Answer}}}}} [/tex]

⠀⠀⠀⠀

Answer:

For every 2 boys in class, there is 1 girl in class

Step-by-step explanation:

Answer:

markup price = $2.25

Step-by-step explanation:

markup = 45% of $5

markup = 45/100 x 5

markup = $2.25

selling price = $5 + $2.25

selling price = $ 7.25

Answer:

$2.25

Step-by-step explanation:

edgems 2020-2021

Answer:

line a

Step-by-step explanation:

because its going higher than line b and when it reaches 10 hours it he wil be way beyond his daugter

Answer: line a

Step-by-step explanation:

line a becuse the walking is going strigt ahead and it quicker too

Answer: 45

Step-by-step explanation:

40% × ? = 18

18 ÷ 40% =

18 ÷ (40 ÷ 100) =

(100 × 18) ÷ 40 =

1,800 ÷ 40 =

45

Answer: 45

Step-by-step explanation:

Answer:

The answer is (3-,5) watch is C cause if you do that but in math form it's the same

Answer:

I think its A

Step-by-step explanation:

Answer:

The mean of all sample proportions from all random samples of 100 dentists in the state of Ohio is equal to 0.72.

Step-by-step explanation:

Slope intercept form - y = m(x) + b. m represents slope, b represents the y-intercept. You should be able to plug in any value for y and x into the equation, and it should result in a true statement.

The y-intercept is easy to find. It is the point where X is equal to zero and the graph line crosses through the y axis. In this case, y intersects at -2. Since we insert the y intercept at b, we can go ahead and plug it in there.

y = m(x) + b > y = m(x) - 2  

Since there is only one option with the y intercept equalling -2, you can go ahead and pick D) y = -x - 2 as your answer, since no other options have the correct y-intercept.

Answer:

2+7

Step-by-step explanation:

its B 15 divide by 3 is 5 because 2 - 5 is -3 - 15 is 5

Answer:

Step-by-step explanation:

25 × 4.5= 112.5 and that is you answer

Answer:

The bigger figure's area is 20m, and the smaller is 6m. :)

Step-by-step explanation:

Answer:

The bigger figure's area is 20m, and the smaller is 6m.

Step-by-step explanation:

bc i know