Please Help!

Choose a method that can be used to solve this system of equations by elimination.

2x – 2y = 24
4x + 7y = –40

A. Subtract 2x from both equations and solve the first equation for y.

B. Multiply the first equation by –2 and add the second equation.

C. Add the first equation to the second equation and subtract 6x from both
sides of the equation.

D. Subtract 7y from the second equation and add the first equation.

Which data set has a greater spread? why? set a: {38, 12, 23, 48, 55, 16, 18} set b: {44, 13, 24, 12, 56} has a greater spread because .

Select the sequences that are geometric.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)