Find the value of mn if ab= 21 cm, bc= 16.8 cm, and lm= 28 cm.

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Ihave trouble finding the nth term of a linear sequence

Kevin's bank offered him a 4.5% interest rate for his mortgage. if he purchases 3 points, what will be his new rate?