Answer:

Step-by-step explanation:
we have

Multiply by
both sides


Adds
both sides


the answer to 7 times z reduced by a third of the product is 2z
Obtuse angles not unit or straight obtuse angle
Answer:
5
Step-by-step explanation:
Each interior angle of the polygon is 108 degrees, so each exterior angle of the polygon is 180-108 = 72 degrees. So the number of sides is 360/72 = 5. Hence it is a regular pentagon.
Answer:
50
Step-by-step explanation:
Use the formula of a trapezoid which is b1 + b2 h/2
8+12=20*5=100/2=50