Answer:
-35a
Step-by-step explanation:
Here, you just distribute: -7 * 5a
= -35a
decagon = 10
nonagon = 9
dodecagon = 12
0.07
0.70-0.63
5x + 13 + 3x + 7 = 180
8x +20 = 180
8x = 160
x = 20
your answers probably gonna be B