There is a close relationship between the correlation r and the slope b of the least-squares regression line. In particular, it is true that

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.

What’s the volume of the triangular prism?