Lets take into account that we are solving for a. To solve for a we must add like terms:
a+16=32
-16=-16
------------
a=16
The answer has to be choice A.
slope formula : 
a. coordinates : (3,12) and (4,16)



b. coordinates : (1,4) and (3,12)



⇒ A. Yes. Both slopes are equal to 4
Answer:1,000
the middle graph
Step-by-step explanation:
Answer:
it is a are b but it could be c
Mean simply means average
so just add them all up and divide by 5
22 + 37 + 49 + 15 + 71 = 195
195/5 = 39
mean = 39