Answer:
2105.4
Step-by-step explanation:
You take 19.8 and subtract 2.4 and get 17.4 as the first step. Then you multiply 17.4 and 12.1 and get 2105.4
28
The standard form: Ax + By = C
y = 90 - 15x <em>add 15x to both sides</em>
The difference of a number and seven is x - 7. So twice that, would be:
2(x - 7)
