Walter takes 7/10 of an hour to mow 2/5 of an acre of lawn. at this rate, how many races will he mow in an hour?

7/10 of an hr60 min / hr7/10(60) = 420/10 = 42 minutes

42 / (2/5) = 60 / x42 minutes to 2/5 acre = 60 minutes to x acres
cross multiply
42x = 2/5(60)
42x = 120/5
42x = 24
x = 24/42
x = 4/7he will mow 4/7( or 0.57) acres in 1 hr

It would be the second one because it passes the vertical line test

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

answer: the slope is equal -1.