Find the missing length. round to the nearest tenth, if necessary.

a right triangle has legs measuring 8 units and x units and a hypotenuse measuring 21 units.
a. 441
b. 22.5
c. 64

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project