12. doug lost his measuring tape, so he had

to estimate the length of a board he had

to cut. he cut off 2 inches, but the board

was still too long. he did this 4 times.

after the fourth cut, the board was the

right length. write and find the value of ar

expression to find the change in the

length of the board.

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.