Acomputer randomly picks a number from the group 75, 76, 77, 78, 79. what is the probability the number selected is greater than 78 or even? enter your answer, as a decimal, in the box.

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Determine domain and range, largest open interval, and intervals which function is continuous.