1) The side lengths of a triangle are 4,5 and 6 units respectively. Find the
a) cosine of the smallest angle in the triangle.
b) radius of inscribed circle and
circumscribed circle of the triangle​

1. a music store marks up the instruments it sells by 30%. a. if the store bought a guitar for $45, what will be its store price? b. if the price tag on a trumpet says $104, how much did the store pay for it? c. if the store paid $75 for a clarinet and sold it for $100, did the store mark up the price by 30%?