Directed line segment WX has endpoints W (-3, 4) and X (21, –8). Part A:
Determine the point that partitions W X into segments in a ratio of 7:5. Express your answer as a coordinate pair.

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )