4 tens, which is 40 and 9 ones, which is 9 40+9
and if the underlined digit is 4, the answer would be 40. if the underlined digit is 9, it would be 9.

3 0

3 years ago

What is the estimated perimeter of an ellipse if the major axis has a length of 15 ft and the minor axis has a length of 7.5 ft?

miskamm [114]

Answer:

Option B is correct.

The estimated perimeter of an ellipse is 37.3ft

Step-by-step explanation:

Given:

Length of Major-axis (2a)=15ft

Length of minor-axis (2b)=7.5ft

For an ellipse, the perimeter (P) approximately given by:

$P\approx 2\pi\sqrt{\frac{a^2+b^2}{2}}$ , where a and b are semi major axis and semi minor axis respectively.(Use approx. value of $\pi =3.1 4$ )

Here, a=7.5ft and b=3.75ft, putting in above equation, we get

$P\approx 2\pi\sqrt{\frac{\left (7.5\right )^2+\left (3.75\right )^2}{2}}$

$P\approx 2\cdot 3.14\cdot \sqrt{\frac{56.25+14.0625}{2}}$

$P\approx\ 6.28\cdot \sqrt{\frac{70.3125}{2}}$

$P\approx\ 6.28\cdot \sqrt{35.15625}$

After solving the square-root we get,

$P\approx\ 6.28\cdot5.92927061$

$P\approx37.3ft$ .

Therefore, the estimated perimeter of an ellipse is 37.3ft.

8 0

3 years ago

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PLEASE HELP!!!

NeTakaya

Answer:

It's A

Step-by-step explanation:

6 0

2 years ago

the lengths of the sides of a rectangle window have the ratio 1.6 to 1. the area of the window 2560 square inches. what are the

Tatiana [17]

The shorter side is 40 in and the longer side is 64 in

8 0

3 years ago

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