3 years ago

Number 15 really need help

2 answers:

8 0

$9 a day for 8 days.

So, for every day that went by they earned $9. In other words the answer is the Amount of Money Earned per day multiplied by the number of days!

So!

$9 * 8days

Or you can also think of it as this:
9+9+9+9+9+9+9+9

Our answer comes out to be 72!

Shkiper50 [21]3 years ago

3 0

9 times 8= 72 so 250 minus 72 is $178 that they still need to make.

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The faces of a regular dodecahedron are what type of polygon?

erastovalidia [21]

It's a Dodecagon polygon because it has 12 sides.
Thank you

4 0

4 years ago

Find the volumes of the solids whose bases are bounded by the circle x^2 + y^2 = 9, with the indicated cross sections taken perp

labwork [276]

x ^2 + y ^2 = 9 => y = y(x) = ± √(9 - x ^2)

Each cross section would be a square with side length equal to the vertical distance between the upper and lower semicircles defined by y(x), which is

√(9 - x ^2) - (- √(9 - x ^2)) = 2 √(9 - x ^2)

The area of each square section is the square of this length,

(2 √(9 - x ^2)) = 4 (9 - x ^2) = 36 - 4x ^2

We get the whole solid for -3 ≤ x ≤ 3, so integrating gives a volume of

$\displaystyle\int_{-3}^3(36-4x^2)\,\mathrm dx=\boxed{144}$