Given: x = r + 2, y = 2 r - 9, and z = r2 + 17 r + 30. simplify [x · y - z] ÷ x.

What is the exact volume of the cylinder (radius 13 in., height 30 in.)

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.

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?