A bag contains n nickels and a quarters worth a total of $40. Which equation models this information?
A. 0.5n+0.25q = 40
B. n+q= 40
C. 5n+257 = 40
D. 0.05n+ 0.250 = 40

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.