Substract. What is the difference (9 x 10^10) - (4 x 10^10) in scientific notation?

Find the area of a trapezoid with a height of 23, base 1 of 10 and base 2 of 18

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?