Quadrilateral ABCD with vertices A(4,3), B(4, -2), C(-4,-2) and D(-4, 3) is a rectangle, find the length of the diagonals.

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

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places