9^2= 9.5^2 + 4^2 - 2 (9.5) (4) (cosr)

i'm trying to find out the angle measure of r

Find the solution of system of equation y= x-4 y=4x+2

Helena lost her marbles. but then she found them and put them in 44 bags with mm marbles in each bag. she had 33 marbles left over that didn't fit in the bags.

Billie holiday sells children's clothing for sara vaughn's toddler shop. baby blankets sell for $29.99 after a markup rate based on cost of 109%. find the cost and the markup.