Which answer choice is equivalent to he sum of the polynomials below? (10*+-6)+(2x^2-9x-12)

A. 3(4x-^2+6)
B. 6(x-3)
C. 6(2x^2-x-3)
D. 18(x^3-1)​

The graph shows the distance y, in inches, a pendulum moves to the right (positive displacement) and to the left (negative displacement), for a given number of seconds x. how many seconds are required for the pendulum to move from its resting position and return? enter your answer in the box.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Which of these side lengths could form a triangle a) 2 cm , 2 cm , 4 cm b) 3 cm , 5 cm , 10 cm c) 3 cm , 4 cm , 5 cm d) 4 cm , 8 cm , 15 cm