Determine the expression that shows a difference of perfect squares and factor it, showing work.

16x2 - 81

14x2 - 49

9x2 + 100

Lf k (x) = 5x - 6, which expression is equivalent to (k + k) (4) ?

F (x) = x2 - 8x + 15 g (x) = x - 3 h (x) = f (x) : g (x) h (x) = ? the domain of h (x) ?

While mining, John found a large metal bar that contained 15 pounds of zinc. John also determined that the bar was 60% zinc. What was the total weight of the metal bar in pounds? Round your answer to the nearest whole number if necessary.

If a=5x^2+3x-7 and b=-3x^2-7x+5 find b-a

If a=4, then what is b? a+b=5a-2b

What is the measure of Z in the parallelogram shown? A. 190 B. 90 C. 150 D. 30

Add. (2x4+x3-4x2+3) + (4x4-2x3-x2+10x+2) Express the answer in standard form. Enter your answer in the box.

A rectangular park has a width of 8/9 of a mile and a length 3/5 of a mile. Find the area of the park. Write your answer in simplest form, using a complete sentence explain your answer.

A female grey whale is 2 times as long as a female killer whale. A female killer whale is 7 meters long. How long is a female grey whalevin centimeters?

Raina's fish tank has 17 liters of water in it. She plans to add 5 liters per minute until the tank has more than 52 liters. What are the possible numbers of minutes Raina could add water? Use t for the number of minutes.