Which of the following is a difference of perfect squares? * 20 points
2x^2 - 4
x^2 + 9
9x^2-16
X-25

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

Secant be and cf intersect at point d inside a what is the measure of cde

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.