Show your work Please on number 4,5,6

The amount of money, in dollars, in an account after t years is given by a = 1000(1.03)^t. the initial deposit into the account was $_^a0 and the interest rate was _a1% per year. only enter numbers in the boxes. do not include any commas or decimal points^t. the initial deposit into the account was $__^a0 and the interest rate is % per year.

Which one is true about the hexagons ?

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6