If the fourth term of a geometric progression is
—81/2 and the fifth term is 243/2 find a1 and r ?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

Ineed with number 6 , explain how to get 1978