Exam Maths Puzzle Algebra

what is [fog](x) if f(x+2X=7 and g(x)+-3x=4

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Exam Other Question

What is log(x) if f(x)= 2x +7 and g(x)= -3x+4. my list of possible answers is
Option
a) -6x-17
b) -6x+15
c) -6x+8
d) -6x-10 You have a money jar containing nickels(.05) and quaters(.25) worth $1.55. The money jar contains 11 coins. How many of each coin do you have?