3 years ago

What is the volume of the sphere? Round the answer to the nearest cubic unit.

Mathematics

2 answers:

joja [24]3 years ago

8 0

Answer:

Step-by-step explanation:

The formula for the vol. of a sphere is V = (4/3)πr³, where r is the radius.

Here, the radius, r, is 18.

Thus, the volume, in terms of π, is V = (4π/3)(18 units)³

This works out to V = 24429 cubic units (24429 cm³)

This is far different from all of the answer choices. Ensure that you have copied this problem down correctly.

Liula [17]3 years ago

7 0

339 because the it says that the radius is 18

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madam [21]

Answer:

$1,385.44 {ft}^{2}$

<h3>4th answer is correct</h3>

Step-by-step explanation:

$\pi {r}^{2} \\ \pi \times 21 \times 21 \\ = 1,385.44 {ft}^{2}$

7 0

3 years ago

Write the given trinomial if possible as a square of a binomial or as an expression opposite to a square of a binomial: 15ab-9a^

MrMuchimi

Answer:

$- \bigg(3a - \frac{5}{2} b) \bigg)^{2}$

Step-by-step explanation:

$15ab-9a^2-6 \frac{1}{4} b^2 \\ \\ = 15ab-(3a)^2-\frac{6 \times 4 + 1}{4} b^2 \\ \\ = 15ab-(3a)^2-\frac{24+ 1}{4} b^2 \\ \\ = 15ab-(3a)^2-\frac{25}{4} b^2 \\ \\ = 15ab- (3a)^2- \bigg(\frac{5}{2} b \bigg)^2 \\ \\ = - \{ - 15ab + (3a)^2 + \bigg(\frac{5}{2} b \bigg)^2 \} \\ \\ = - \{ (3a)^2 + \bigg(\frac{5}{2} b \bigg)^2 - 15ab \} \\ \\ = - \bigg(3a - \frac{5}{2} b \bigg)^{2}$