You have to have a picture of the question bro
Answer:
90 mph
Step-by-step explanation:
Average speed is given by
Average speed=(initial+final speed)/2
Given average speed of 60 mph then considering initial speed of 30 mph. Let x be the final speed hence
60=(30+x)/2
120=30+x
X=120-30=90 mph
Therefore, the return trip speed is 90 mph
No. The sign of a function is not related with the fact that it is growing of decreasing.
If the function in the decreasing in the interval (a,b) it means that f(b) < f(a), but yet both f(b) and f(a) may be positive.
For example imagin the function y = - x. It is a straight line and it is decreasing for any interval that you take; this is (-∞, ∞).
If you take the interval (- ∞, 0) the function is decreasing but the values are positive. If you take the interval (0, ∞) the function is decreasing and the values are negative.
Part A.
Answer: B.-2°F
Part B.
Answer: A. -0.5°F