1.
Cross multiply and solve for x.
2/1.4 = 7/x
2.
What are your choices?
1. Rodney can pick 2 rows of string beans in 1 hour and 24 minutes. At this rate, how long will it take him to pick 7 rows of beans?
2. The formula for finding the perimeter of a rectangle is P=21+2w. Which equation solves for w in terms of l and P?
2 answers
1.
1 h = 60 min
1 h 24 min = 84 min
( 7 / 2 ) * 84 min = 7 * 84 / 2 = 588 / 2 = 294 min
4 h = 4 * 60 = 240 min
294 min = 240 min + 54 min
294 min = 2 h 54 min
2.
P = 2 l + 2 w
P - 2 l = 2 w
2 w = P - 2 l Divide both sides by 2
w = ( P - 2 l ) / 2
OR
w = ( P / 2 ) - l
1 h = 60 min
1 h 24 min = 84 min
( 7 / 2 ) * 84 min = 7 * 84 / 2 = 588 / 2 = 294 min
4 h = 4 * 60 = 240 min
294 min = 240 min + 54 min
294 min = 2 h 54 min
2.
P = 2 l + 2 w
P - 2 l = 2 w
2 w = P - 2 l Divide both sides by 2
w = ( P - 2 l ) / 2
OR
w = ( P / 2 ) - l
1 answer