Need help Which is the best first step when solving the following system of equations?
50+40= 10
3c+20= 16

A. Multiply the first equation by -2.

B. Solve for d in the second equation.

C. Solve for c in the first equation.

D. Multiply the second equation by -2.

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Reflect the point (7,0) across the y-axis