What is the first term of the arithmetic sequence when the third term is 12 and the 8th term is 37?

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

Three coins are flipped. what is the probability that there will be at least two tails?

15 point ! ~ see if you know the answer to both you!