Simplify 3^2 × 3^7 What is the value of the exponent?

Liam's parents are driving three times as fast as liam is biking, but they left later than he did. if his parents caught up with him two hours after he left, how much later than liam did they leave?

Can any one me with the answers to these questions asap?

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