Please help im very confused

The answer to your question is 7c. V = 14327.82 u³

                                                    7c. SA = 1755.26 u²

Step-by-step explanation:

7c.

Formula

V = 1/3 πr²h

π = 3.14

r = 13

h = ?

-Use the Pythagorean theorem to find h

  h² = 30² - 13²

   h² = 900 - 169

  h² = 731

  h = 27

-Calculate the volume

V = (3.14)(13)²(27)

V = 14327.82 u³

7c.

SA = πrs + πr²

-Substitution

SA = (3.14)(13)(30) + (3.14)(13)²

-Simplification

SA = 1224.6 + 530.66

-Result

SA = 1755.26 u²

one fourth of 9% = 2.25%

gavin is correct in saying : the equivalent quarterly interest rate would be

2.25%.