What is the slope of a line that runs parallel to y = -x + 7? use a number to fill in the blank.

Need on this geometry question. explain how you did it.

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?

Evaluate cos2θ for cosθ = square root of 3/2