a pack of cinnamon scented pencils sell for $4.00. What is the sales tax rate if the total cost is $4.32? pl help and pls put an explanation too

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