Simplify the expression r^-3s^5t^2/r^2st^-2

Find an equation for the linear function which has slope -10 and x-intercept -7

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?