The "34" play an important role to connect the around numbers. What number in place "??" ?

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

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)