Please help! Which expression is equivalent to 4(1/4x+3) - (1/2x-9)?

A. -1/4 x + 12
B. -1/4 x + 21
C. 1/2 x + 21
D. 1/2 x + 12

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?

The polynomial 10x3 + 35x2 - 4x - 14 is factored by grouping. 10x3 + 35x2 - 4x - 14 5x )-20 what is the common factor that is missing from both sets of parentheses?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?