Which of the following is a prime number?

A. 81

B. 51

C. 91

D. 331

What is the interior angle sum of a 15-gon?

If a and b are both positive numbers and a values?

What is the acceleration of a trains emergency stop from 80 km/h in 8.30 s?

Factor the following polynomial completely. 10x^4 + 80x^3 + 1120x^2 A. - 10x^2 (x+2) (x+6) B. 10x^2 (x+2) (x+6) C. - 10x^2 (x-2) (x+6) D. 10x^2 (x+2) (x+6)

Set up and solve a system of equations to solve the problem. Casey wants to buy a gym membership. one gym has a $150 joining fee and costs $35 per month. Another gym has no joining fee and costs $60 per month.

A number decreased by 30% and the result was 7560. What was the original number? A. 2268 B. 9828 C. 5292 D. 10800

3 over 8 times 8 over 9

Find the unit rate for number of parts manufactured per hour if 1363 parts are made in 5 hours. Round to the nearest integer.

Zoe needs to buy beads to make jewelry. For each earning, Zoe uses 3 small blue beads, 1 metallic bead, and 2 large green beads.

In matg, what are coefficients?