Which of the following is a cost estimating relationship? select one: a. mathematical equations based upon regression analysis b. cost-quantity relationships c. cost-cost relationships d. all of the above

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

What is not true about kl and mn? what is mn? (show your work)