Answer:
Yes, good for him. lol
Step-by-step explanation:
subtract 6.4 from 25 = 1.3c + 18.6
For every function you need evaluate the function for every value in the domain D. And the collection of this values correspond to the range of the function.
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4. 
-11 = a + 7 Given
-7 -7 Subtract 7 on each side to cancel out +7 and isolate variable
-18 = a Answer
Prove.
-11 = -18 + 7 Plug in variable value
-11 = -11
True.
700 cal out of the 2000
2000*.35