Part A:
To simplify the expression 3(9a+6b)−(5a+2b), we need to distribute the 3 and perform the subtraction:
3(9a+6b)−(5a+2b) = 27a + 18b - 5a - 2b
Combining like terms, we get:
27a - 5a + 18b - 2b = 22a + 16b
Therefore, the simplified expression is 22a + 16b.
Part B:
If a represents apples that cost $0.35 each and b represents bananas that cost $0.20 each, we can substitute these values into the expression 22a + 16b to find the total cost.
22a + 16b = 22($0.35)a + 16($0.20)b
= $7.70a + $3.20b
Therefore, the total cost based on the expression is $7.70 per apple and $3.20 per banana.