Solve for x.

A.
x = -2
B.
x = 21
C.
x = 14
D.
x = -14

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

Amachine part consists of a half sphere and a cylinder, as shown in the figure. the total volume of the part is π cubic inches.

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?