exam Maths Puzzle Numerical Ability

Find each value if f(x)=7x+2 and g(x)=4x-x/2.

1. f(-7) 2. g(8) 3. f(8/14) 4. g(-6n)


Please help me find the answers. I dont understand.

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exam Other Question
simplify: (5y)(-6y4) the last four is to the fourth power. What graph would match the function:
f(x)= x^3+2x^2-3x-2

Thank you for your help.