Question 1132596
i think 2a + 7 is your answer.


p is the average of 3a + 7 means p = (3a + 7)/2


q is the average of 5a and 13 means q = (5a + 13)/2


r is the average of 4a and 22 means r = (4a + 22)/2


to get the average of p, q, and r, you need to add them together and divide by 3.


adding them all together, you get (12a + 42)/2 = 6a + 21.


divide 6a + 21 by 3 and you get 2a + 7.


that should be your answer.