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24.06.2020 •
Mathematics
Solve each equation for x 3х- 12у= 27
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Ответ:
Explanation
Step 1: Add 12y to both sides
3x-12y+12y=27+12y
3x=12y+27
Step 2: Divide both sides by 3
3x/3=12y+27/3
x=4y+9
Ответ:
Let $d$ be the length of one segment of the race.
Average speed is total distance divided by total time. The total distance is $3d$, and the total time is $\frac{d}{3}+\frac{d}{20}+\frac{d}{10}=\frac{29d}{60}$.
Thus, the average speed is $3d\div\left(\frac{29d}{60}\right)=\frac{180}{29}$. This is closest to $6$, so the answer is $\mathrm{(D)}$