Do repeated addition to 1 and 1/2 to get the answer
10.2 is the right answer 10 dollars and 20 cents is more then 10 dollars and 02 cents
Answer:
B
Step-by-step explanation:
All the angles should add up to 360°.
8x+10x+9+21x-12+90=360°
Group like terms together.
So,8x+10x+21x+9+90-12=360
39x+87=360
39x=360-87
39x=273
x=7