Evaluate the expression 2.5 with an exponent of 2

Twelve less than a number is at most 20

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.