The amount of money Sharita makes varies directly with the number of hours she works. If she earns $41.25 for 5 hours of work, how much will she earn if she works 8 hours?
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41.25/5 = x/8 (41.25 for 5 hrs = x/8 hrs)
(5)(x) = (8)(41.25)
5x = 330
x = 330/5
x = 66
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@kelliegirl33 can u walk me threw this one Tommy averages one hit for each five times at bat. Use a direct variation formula to determine how many hits would be expected from Tommy after 20 times at bat.
Tommy averages one hit for each five times at bat. Use a direct variation formula to determine how many hits would be expected from Tommy after 20 times at bat.
because we are cross multiplying. Take the numerator of one and multiply it by the denominator of the other one and vice versa. Then solve for the missing variable.
1/5 = x/20 (1 hit for 5 times at bat = x hits for 20 times at bat.
(5)(x) = (20)(1)
do you understand so far ?
can you solve for x now ?
(5)(x) = (20)(1)
5x = 20
now divide by 5 to get x by itself
x = 4
you only set it up this way if it varies directly, not if it varies indirectly
If it varies indirectly, you have to use inverse proportion