Which number makes this sentence true?
21: 30=x: 50

a. x=30
b. x=32
c. x=35
d. x=41

If i have one apple and give you the apple, how many apples do i have?

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.  

6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution