Question

Need some help with the questions in the image
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Answer 1

1a. E = IR, I = 5, R = 3

E = 5 × 3

E = 15

b. A = πrl, π = 3.14, r = 5, l = 20

A = 3.14 × 5 × 20

A = 314

c. S = 90 ( 2n - 4 ), n = 6

S = 90 ((2 × 6) - 4)

S = 90 ( 12 - 4 )

S = 90 ( 8 )

S = 720