What is the value of sin C

Write a recursive sequence that represents the sequence defined by the following explicit formula:

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Urgent? will give brainliest given that the blue triangle is a right triangle, which expression correctly gives the area of the red square? a) a2 + b2 b) a2 - b2 c) a2 - c2 d) c2 - a2