Given:
Cost of cleaning the exterior = $8
Cost of cleaning the interior = $6
Number of exteriors they clean = 9
Number of interiors they clean = 5
Let's write and simplify an expression to find out how much money the students raised in all.
To write the expression, we have:
(Cost of cleaning the exterior x number of exteriors cleaned) + (cost of cleaning the interior x number of interiors cleaned)
Hence, we have:
(8 x 9) + (6 x 5)
Let's simplify the expression.
(8 x 9) + (6 x 5) = 72 + 30 = $102
The students raised $102 in all.
ANSWER:
Expression: (8 x 9) + (6 x 5)
Amount raised: $102