Question

Can you help me with this question

Answer 1

2.4 cm

Explanation:

Formula

`V = \pi r^(2) h`

Substitute Known Variables

`138 = (3.14)(r^(2))(7.8)`

Multiply Known Variables

`138 = (24.292)(r^(2) )`

Divide Volume By 24.292

`(138)/(24.292) = r^(2)`

`5(4135)/(6073) = r^(2)`

Find The Squared Root Of Both Numbers

`\sqrt{5(4135)/(6073) } = \sqrt{r^(2) }`

`2.38346021471... = r\\r = 2.38346021471...`

Round The Answer To The Nearest Tenth

2.4 cm