exam Maths Puzzle Numerical Ability

what are 3 digits and 2 digits consecutively????

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Slope-Intercept Assignment

Identify the slope(m)and y-intercept(b)and graph the equation

1. Y=1/2x-2
2. f(x)= 3x+ 2
3. f(x)= -2x -2
Q: log x + log 20=2. Then x =

By using the calculator I know that x=5
How would I work this problem without a calculator?