what is the complete factorization of x2 + 2x - 63? A. (x+21)(x-3) B. (x-9)(x-7) C. (x+9)(x-7) D. (x-21)(x+3)

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

What is the sum of these mixed numbers 2 1/8 + 4 3/8

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)