exam Maths Puzzle Numerical Ability

How do I evaluate each function for the value of:

f(x)=x^2-7x+10; find (a) f(0), (b) f(5), and (c) f(-2)
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exam Other Question

What is the process to solve x - 2x = 15 ? Do I have to factor something?
thanks!
Graph the solution set: 3x+5y>-15
x+3y>-6
x>-0,y>-0