You need to find the total distance and the total time. The total distance is two times the distance to school, 2d.s=d/t=>t=d/sWhere s is speed, d is distance and t is time. So the time taken to get to school is:d/s1and the time taken to get back is:d/s2so the total time is:d/s1+d/s2=d(1/s1+1/s2)So, as speed = distance/time, divide the total distance by the total time:2d/d(1/s1+1/s2)=2/(1/s1+1/s2)=2/(1/20+1/40)=80/3≈26.7km/hr
Answer:
70
Step-by-step explanation:
-7 × -5 = 35
35 × 2 = 70
Hi!
I can help you with joy!
First, use the Distributive Property:
4(2i-3)=20
8i-12=20
Now, move -12 to both sides, using the opposite operation:
8i=20+12
8i=32
Now, divide both sides by 8:
i = 4 (Answer)
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