What is the distance between the points (-9, 4) and (3, -12)

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.