If p is a prime number, for how many values of p is p^2 + 21p - 1 also prime?

Tricia made a circular mat from a square piece of cloth as shown in the diagram below. -14 in. In terms of pi, what is the circumference, in inches (in.), of the circular mat? O O o O 147 inches 287 inches 49 inches 567 inches

Solve the following system of equations: 5x + y = 9 3x + 2y = 4 (-2, 5) (1, 4) (2, - 1) (4, - 4)

How do you find unit rates

Rewrite the equation by completing the square 4x^2 + 28x + 49=0

Which of these are expressions? 298 22 x 3 7x = 63 a + b + c 0

1/3 + 1 + 3 + 9 + ... find the sum of the first 7 terms for the geometric series A: 1093 1/3 B: 364 1/3 C: 243 1/3 D: 121 1/3

What is the expression written using each base only once? (-4) ^-6 * (-4) ^7 A. 4^13 B.-4 C. 13 D. 1 Find the simplified form of expression. Give your answer in scientific notation. (3 x 10^6) (8 x 10^-4) A. 1.1 x 10^3 B. 2.4 x 10^3 C. 1.

1/5x - 4 = x - 20 / 5

Select the action you would use to solve x/4 = 16. Then select the property that justifies that action

The difference of two numbers is 720 the smaller of the numbers is 119 what is the other number