Simplify the expression 21b4 − 3b by combining like terms. choose the correct answer just tell me the answer i'm running out of time.
18b^3
21b^4 − 3b
18b^5
18b^4

Find the perimeter of the figure shown above. a. 18 yds c. 20 yds b. 10 yds d. 24 yds select the best answer from the choices provided

What describes horizontal cross section of the right rectangle 6m 8m 5m

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?