If (9x − 4)(9x + 4) = ax2 − b, what is the value of a? the value of a is

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

F. a fair coin is thrown in the air four times. if the coin lands with the head up on the first three tosses, what is the probability that the coin will land with the head up on the fourth toss? a. 0 b. 1/16 c. 1/8 d. 1/2

Which expression is equivalent to 5a/4 - b/8 ?