Answer:
12
Step-by-step explanation:
The average rate of change of f(x) in the closed interval [ a, b ] is
Here [ a, b ] = [ 3, 6 ] , then
f(b) = f(6) = 6² + 3(6) + 2 = 36 + 18 + 2 = 56
f(a) = f(3) = 3² + 3(3) + 2 = 9 + 9 + 2 = 20 , then
average rate of change = 
= 
= 12
なぜあなたはそれを翻訳するのですか、答えは2番目です???（：FOTOMATH;(
First you calculate the total cost of the pears:
18,4 pounds x $1,75 = $32,2
Them you add the cost of the pineapple:
$32,2 + $2,89 = $35,09
After this you can divide the total cost (35,09) for 4 friends getting the amount due to each one:
35,09/4 = $8,77
