2. ken mails three packages at the post office that weigh 8.1, 8.5, and 8.9 pounds. the post office that ken uses rounds the weight of a package to the nearest pound to determine the price of shipment. it costs $2 to mail a package that weighs 8 pounds and $2.75 for packages that weigh 9 pounds.
a. how much did ken pay to ship each package?
b. ken has $7.25 in his wallet in cash. use subtraction to determine whether ken has enough to mail the three packages and how much extra money he has or needs.

Kevin has a spinner that has 10 equal sections and 2 sections of each color—red, blue, green, yellow, and purple. kevin spins the spinner 180 times. kevin determines about how many times the spinner will land on red or green, and his work is shown below. -kevin has the formula reversed; it should be the total number of sections over the number of red or green sections. -kevin should have used a 4 in the numerator because there are 2 red sections and 2 green sections. -kevin should multiply by the number of sections in the spinner rather than the total number of spins. -kevin calculated the prediction correctly and did not make any mistakes.