9x+3x=180 by def. of supplementary
12x=180
12/12x=180/12
x=15
9x=9(15)=135°
Answer:
897 liters
Step-by-step explanation:
The motor oil is composed of 8 liters of natural oil and 5 liters of synthetic oil. This means there is a ratio of 8/5. We have 552 liters of natural oil to y liters of synthetic. This is the ratio 552/y. Create a proportion that compares the two ratios.

Solve by cross multiplying.
8y = 5(552)
8y = 2,760
y= 345
345 liters of synthetic oil.
Together 552+345= 897 liters of motor oil.
Answer:
96 = 24 + 3b
96 students in all, 24 in cars and the rest in 3 buses
Answer:
C) 36
Step-by-step explanation:
You have to add all the numbers together and then divide by the amount of numbers, in your case 5.
18 - 22 + 5x(66:3)
= 18 - 22 + 5x22
= -4 + 110
= 77
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