A sawmill cuts boards for a lumber supplier. When saws A, B, and C all work for 4 hr, they cut 4200 linear board-ft of lumber. It would take saws A and B working together 5.6 hr to cut 4200 ft of lumber. Saws B and C can cut 4200 ft of lumber in 6 hr. Find the rate (in fuhr) that each saw can cut lumber.

Choose the number sentence that shows the identity property of addition. a. 122 = 61 + 61 b. 62 = 1 + 61 c. 61 = 0 + 61

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.