Answer:
2y-10
Step-by-step explanation:
-2(7-y)+4
distribute:
=(-2)(7)+(-2)(-y)+4
= -14+2y+4
Combine like terms:
= -14+2y+4
=(2y)+(-14+4)
= 2y+-10
Answer:

Step-by-step explanation:
Assuming 
What we have to do is replace f(x) with y, swap the locations of x and y, and then solve for y.

Common difference r will be the difference between next two values of number row, so we take e.g. second minus first: r=9.4-6=3.4. You can see, that this value is constant as we go through next pairs of values.
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