um I need assistance ASAP please please please!

Question

1.) The voltage V across a capacitor at time t seconds is given by

Identify the voltage across the capacitor at 8 seconds to the nearest hundredth.

A.) 5.49 V

B.) 4.39 V

C.) 6.20 V

D.) 6.69 V

2.) Identify all of the real eighth roots of −256.

A.) −2

B.) −2, 2

C.) 2

D.) no real eighth roots

Answer 1

1) Just plug t=8 into the equation and compute the answer. Use you calculator.

2) Plug 2 and -2 into your calculator and raise them to the 8th power: 2⁸ and (-2)⁸. That'll tell you if it's A, B, or C. It's not D.