Answer:
x=1
Step-by-step explanation: Snap Add?
I don't know what this means:
"because the consecutive angles of a parallelogram are . Solving for x gives x ="
I know that (5x-12) + (x+6)
1. 5x-12+x+6=0
2.6x-6=0
3.6x=6
4.x=1
Looks like all you have to do it multiply the numbers together; there is no application of the Distributive Property to these problems.
3 for 3.60 the unit price come out to 1.20

Negative multiply negative = Positive
Negative multiply positive = negative

Thus the answer is -4a + 16b - 12c - 12d.