if $$x=\sqrt {64}+\sqrt {121}-\sqrt {169}$$, the find the value of x²

A prism and a pyramid have the same base and the same height. Find the ratio of the volumes of the prism and the pyramid.

In a trapezium ABCD, AB and DC are parallel to each other with a perpendicular distance of 8 m between them. Also, (AD)=(BC)=10 m, and (AB) = 15 m <(DC). What is the perimeter (in m) of the trapezium ABCD?

The median of a set of 11 distinct observations is 73.2. If each of the largest five observations of the set is increased by 3, then the median of the new set:

The angle of elevation of the top of a tower from the top of a building whose height is 680 m is 45° and the angle of elevation of the top of same tower from the foot of the same building is 60°. What is the height (in m) of the tower?

A person can hit a target 5 times out of 8 shots. If he fires 10 shots, what is the probability that he will the target twice?

The largest three-digit number that gives the same remainder 2 when divided by 3, 5 and 9 is ________.

Find the average of the following sets of numbers.

693, 456, 876, 532, 934, 691, 596, 398, 682