If the ratio between the radii of two spheres is 3:7, what is the ratio of their volumes?

A. 27:343
B. 9:49
C. 9:7
D. 21:49

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

3/4 = c/36 i need with this fraction proble.

The graph represents this system of equations: 2x + y = 3 2x - 5y = 15 what is the solution to the system of equations represented by the graph? (0, -3) (1,1) (1.5,0) (2.5, -2)