Hi, I'm trying to figure out #17 but I am having trouble on how to solve it. Any help would be greatly appreciated! Thank you.

The mechanical advantage of the wheelbarrow is the product of the mechanical advantage of the lever, and the mechanical advantage of the wheel and axle. Therefore, the wheelbarrow has a mechanical advantage of 4.

hope this helps :D

real, smaller and upside-down.   so the answer should be b.

temp rises, and expansion