Answer:
Average speed
= 5 5/6 mph , or
= 5.83 mph (to 2 decimals)
Step-by-step explanation:
Average speed is total distance divided by the total time it takes to cover the given distance.
Since uphill = 5 mph, and downhill = 7 mph, we know the average speed is between 5 and 7 mph.
Let
x = distance uphill, and also distance downhill.
Total distance = 2x miles
Total time = x/5 + x/7 hours = 12x/35 hours
Average speed
= total distance/total time
= 2x / (12x/35) mph
= 70x / 12x
= 5 5/6 mph
= 5.83 mph (to 2 decimals)
For example: 35 divided by 5 is 7. So to check with multiplication, just think 7 times 5 is what? 35. This is the same formula for everything.
Hope this helps!!
Answer:
Step-by-step explanation:
9. (-2, 2) (4, 3)
(3 - 2)/(4 + 2) = 1/6
10. (-2, 2) (3, 4)
(4 - 2)/(3 + 2) = 2/5
11. (3 - 13)/(0 + 16)= -10/16= -5/8
12. (-19 - 0)/(7 + 12) = -19/19= -1
