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Solve the equation x/4 - 5= -8 -27 -12 -7 12

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.