priceisright11401
15.06.2020 •
Mathematics
If y varies directly as x, and y=8 when x=3, find y when x=15.
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Ответ:
y=40
Step-by-step explanation:
The formula for Direct Variation is y=kx or k=y/x. In this case I would use k=y/x. If you're y is 8 and x is 3, this means that K=8/3. Using this, we know that X=15. We have to find a Y value so that the fraction with an x of 15 simplified is 8/3. To do this you would write 8/3 and y/15. Now cross multiply to get 3y=120. Divide by 3 to get y=40. View my attachment for the work!
Ответ:
3.5% = 0.035
Then multiply by the decimal:
600 • 0.035 = 21
Your answer is C: 21 phones