Answer:
40 mph.
Step-by-step explanation:
Suppose grandma's house is 30 miles away (any distance would do but 30 is convenient).
Speed = distance / time
time = distance / speed
Time to get there = 30/60 = 1/2 hour.
Time to get back = 30/30 = 1 hour
Average speed = total distance/ total time
= (30 + 30) / ( 1 + 1/2)
= 60 / 1.5
= 40 miles per hour.
You cannot take the average of the speeds directly
(60+ 30)/2 = 45 is not correct as you cannot average ratios ( speed is a ratio).
<span>
D. 15:1
is equivalent to 30:2. (:</span>
- 12. What do you mean by that question? -12 itself is an integer.
Answer:
<h3>#4</h3>
It includes all the points between those endpoints.
<h3>#5</h3>
Intersection of the planes results in line.
<h3>#6</h3>
An axiom is a statement that is so evident or well-established, that it is accepted without controversy or question
