Someone thats amazing at math helppp

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.