Solve for m. e=cm/r
a. m=e+r/c
b. m=er/c
c. m=e-rc
d. m=e+rc

E=cm/r To solve for m, you have to get it by itself on one side of the equal sign. To do that you have to eliminate c and r and put them at the other side. r is being divided by m, so you have to do the opposite to get it on the other side, which is multiply. Multiplying r to both sides will remove the division, and give you Er=cm. So... B is the answer :)

Byou start by adding them all and setting them equal to 180 since that is half of the total degrees in a circle.(2x+8) + (3x-14) + (3x-14) = 1808x-20 = 1808x = 200x = 25