8. The first term and common difference of an arithmetic progression are a and - 2, respectively. The sum of the first n terms is equal to the sum of the first 3n terms. Express a in terms of n. Hence, show that n = 7 if a = 27.

Fa bus driver leaves her first stop by 7: 00 a. m., her route will take less than 37 minutes. if she leaves after 7: 00 a. m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.

Find the values of the variables in the kite