The answer rounded to the nearest hundredth is 152.93
Answer:
Step-by-step explanation:
3x^2 - x + 2x^2 + 3x = 5x^2 + 2x
Answer:
- 3.9 hours
- 90 mph
Step-by-step explanation:
<h3>1.</h3>
The sum of the rates of painting, in fences per hour, is ...
1/9 + 1/7 = (9+7)/63 . . . . fences per hour
The total rate in hours per fence is the inverse of that:
63/16 = 3 15/16 ≈ 3.9 . . . hours to paint the fence
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<h3>2.</h3>
The relevant relationship is ...
distance = speed × time
Let t represent Tom's speed in miles per hour. Then George's speed is (t-36). They both have traveled the same total distance at the point where Tom catches up.
(2+3)(t-36) = 3t
2t = 180 . . . . . . . add 180-3t
t = 90 . . . . . . divide by 2
Tom's average speed is 90 miles per hour.
Answer:
x = -25
Step-by-step explanation:
solve for x by simplifying both sides of the equation, then isolating the variable.
Answer:
a) 5r +3 + 2(r+9) = 7r + 21
b) 2 (4w - 5) - 2 (w - 7) = 6w + 4
Step-by-step explanation:
a) 5r +3 + 2(r+9) = 5r +3 + 2r +18 = 7r + 21
b) 2 (4w - 5) - 2 (w - 7) = 8w -10 -2w +14 = 6w + 4
