Acar repair shop charged $80 per hour for labor and $210 for the parts of a car. if the total cost of repair for the car was $490, how many hours did it take to repair the car?
0.59 2.71 3.50 8.75

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .