the right triangular prism has a volume of 1650 cubic meters. What is the value of x? If height is 15 cm and base is 22 cm..
a. 8m
b. 8.5m
c. 10m
d. 12m
e. 12.5m

Well, I can't see what is 'x' in your question. Remember that volume of a prism is the base area times the height of the prism. The area os a triangle is given by half its base times it's height.

I also don't know what you mean by 22 cm for the base.

Volume = Base Area \times Height