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3 years ago

9

solve the system of linear equations using substitution. Which expression would be eastier to substitute into the other equation

, in order to solve this problem?

1 answer:

Colt1911 [192]3 years ago

7 0

The x=7y-4 one and put it to where the x in the other equation is.

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if the height of the cylinder with a radius of 12 cm and a height of 20 cm has the same volume as a cone with a radius of 8 cm.

Marrrta [24]

Answer:

$\large\boxed{H=135\ cm}$

Step-by-step explanation:

The formula of a volume of a cylinder:

$V=\pi r^2H$

r - radius

H - height

We have the radius r = 12cm and the height H = 20cm. Substitute:

$V=\pi(12^2)(20)=\pi(144)(20)=2880\pi\ cm^3$

The formula of a volume of a cone:

$V=\dfrac{1}{3}\pi r^2H$

r - radius

H - height

We have the radius r = 8cm and the volume V = 2880πcm³. Substitute:

$\dfrac{1}{3}\pi(8^2)H=2880\pi\qquad\text{divide both sides by}\ \pi\\\\\dfrac{1}{3}(64)H=2880\qquad\text{multiply both sides by 3}\\\\64H=8640\qquad\text{divide both sides by 64}\\\\H=135\ cm$

7 0

3 years ago

What is the square root of 10

Elodia [21]

The square root is 2

8 0

3 years ago

Two questions in 1 please help

never [62]

Answer:

1 and idk the second

Step-by-step explanation:

8 0

3 years ago

Match the event with the most

Tema [17]

Answer:

I'd sayyyy certain

Step-by-step explanation:

I'm stopped sorry xd

3 0

2 years ago

Plz help me brainlest for the 1st answer

iren2701 [21]

The answer is a medium Pizza of 12 inches radius.

The formula for finding the area of a square is pir^2(sorry but my phone won’t let me write pi in its symbol form). If we substitute 3 for pi, then that would the 3r^2. Then we would substitute the potential answer choices until we reach one that is closest to 400 in^2. For the small pizza, that would be 9*9*3, which is also 243 inches square. For the medium pizza, that would be 12*12*3, which is also 432 inches square. Finally, for the large pizza it is 15*15*3, which is 675. Therefore, the medium pizza has an area closest to inches square.

4 0

3 years ago