Answer:
An expression represents the amount of change she receives after her purchases is y=-1.79a-0.36b+27.01
Step-by-step explanation:
Let a represents the number of pounds of apples
Let b represents the number of bananas
Cost of 1 pound apple = $1.79
So, Cost of a pounds apples = 1.79 a
Cost of 1 banana = $0.36
Cost of b bananas = 0.36b
Cost of 3 lb bag of potato i.e. 3 pounds of potato = $2.99
So, Total cost = 1.79a+0.36b+2.99
Abigail has $30.00 to buy groceries
Let y be the change received by her
So, Change received by her:
y = 30-( 1.79a+0.36b+2.99)
y= 30-1.79a-0.36b-2.99
y=-1.79a-0.36b+27.01
Hence  expression represents the amount of change she receives after her purchases is y=-1.79a-0.36b+27.01