Factor completely 4x2 − 81.
(4x − 9)(x + 9)
(2x + 9)(2x + 9)
(2x + 9)(2x − 9)
(2x − 9)(2x − 9

Roger and natalie travel in similar cars. roger's car drives the two miles to school in 7.5 minutes. natalie drives the same distance in the opposite direction but in only 6.5 minutes. what is true of their velocities?

What is the volume of this square pyramid?

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