Multiply.(9 - 2r)(9 + 2r)

A. 81 + 36r - 4r2
B. 81 - 36r - 4r2
C. 81 - 4r2
D. 81 - 2r2


Answer: C

Mathematics

You might also like to view...

Use a vertical format to find the product.x2 + 6x + 2

A. 15x5 + 90x3 + 30x B. 8x3 + 55x2 + 58x + 14 C. 8x3 + 7x2 + 42x + 14 D. 15x5 + 55x2 + 42x + 9

Mathematics

Decide whether the slope is positive, negative, zero, or undefined.

A. Zero B. Negative C. Positive D. Undefined

Mathematics

Solve the problem.Mary and her brother John collect foreign coins. Mary has twice the number of coins that John has. Together they have 135 foreign coins. Find how many coins Mary has.

A. 81 coins B. 45 coins C. 18 coins D. 90 coins

Mathematics

Graph the region described by the inequality.2x ? -5y

A.

B.

C.

D.

Mathematics