Answer:
(22-d)× 0.25 + d = 10.75 equation that can be used to find d, the number of dollar coins Giuliana has.
Explanation:
Given : Giuliana has 22 quarters and dollar coins worth a total of $10.75
We have to find an equation that can be used to find d, the number of dollar coins Giuliana has.
Let he has d dollar coins then number of quarter coins is (22-d)
We know 1 quarter = 0.25 dollars
then (22-d) quarter = (22-d)× 0.25 dollars = $5.5 - 0.25d
Thus,
The equation becomes,
(22-d)× 0.25 + d = 10.75.
That is $5.5 - 0.25d + $d = $ 10.75.
thus, 0.75d = $ 10.75 - $5.5
On solving d = 7
Thus, (22-d)× 0.25 + d = 10.75 equation that can be used to find d, the number of dollar coins Giuliana has.