Answer:
-3+x=x+4
Step-by-step explanation:
Pls Mark Brainliest
The answer is, side QR=8 units
A) We know that

where d

= distance,
v = velocity,
t = time
In this case, d = 2 mi., t = 30 min. So we get

Dividing both sides by 30, we get

Thus a function for his walk would be

where y = distance and x = number of minutes he walks.
b) Domain of a function is a set of x-values on which the function defined. In this case, the number of minutes is 30 at maximum. So the domain of the function is [0, 30].
I personally think that the answer is D. In other word, Derek originally scored an 83% but received 11 extra credit points in order to have an overall score of 94%.