The 2nd term of an exponential sequence is 9 while the 4th term is 81.find the common ratio, the first term and the sum of the first five terms of the sequence

Ivan and jeff buy a package of 8 pens for $4.00. ivan wants 5 of the pens, and jeff wants 3.how much should each student pay?

Which one is true about the hexagons ?

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?