exam Maths Puzzle Numerical Ability

Hi, I am helping my grandson with his homwork and I have no idea how to do algebra.

Equation: x% = 2x + 1 divided by 300

I would appreciate any help you could give me. Thanks

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exam Other Question

Write the quadratic function in the form f(x)=a(x-h)^2+k; Find the vertex and graph the function
(a) f(x)=x^2-6x
(b) f(x)=-x^2+4x+1
(c) f(x)=3x^2-10x+2 s=3t+1

find the range of the function if the domain is {-3,0,3}