Clear fractions then solve by substitution.
+ 
= 4
- 2y = 21
A. {(-6, 8)}
B. {(6, -8)}
C. {(x, y)| 7x + 5y = 48}
D. ?
Answer: B
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A leprechaun places a magic penny under a? girl's pillow. The next night there are 2 magic pennies under her pillow. Each night the number of magic pennies doubles. How much money will the girl have after 19 ?nights?
Use front-end rounding to round each number. Then, add or subtract the rounded numbers to get an estimated answer. Finally, find the exact answer.estimate exact
A. Estimate: 13,000; exact: 13,275.44 B. Estimate: 12,000; exact: 12,275.44 C. Estimate: 13,000; exact: 13,375.44 D. Estimate: 12,000; exact: 12,375.44
Solve the problem.f(x) = 2x + 1 and g(x) = 2-x + 3 .Find the point of intersection of the graphs of f and g by solving f(x) = g(x).
A. (1, 4) B. (4, 1) C. (1, 2) D. (2, 1)
Solve the problem.Ken and Kara are 30 miles apart on a calm lake paddling toward each other. Ken paddles at 4 miles per hour, while Kara paddles at 7 miles per hour. How long will it take them to meet?
A. 2
hr
B. 2
hr
C. 10 hr
D. 19 hr