12x - 10)
(2x)
3. which of the following is a property of all parallelograms?
a. only one pair of opposite sides is congruent;
b. each pair of opposite angles is congruent,
c. each pair of opposite angles is supplementary,
d. there are 4 right angles.

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.