Write the missing digits in each calculation so that the value of each sum or difference is correct. Be prepared to explain your reasoning ( I will mark brainlist if you answer correctly with the correct explanation)

Sorry guys but as you have a small brain

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.

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?