exam Maths Puzzle Numerical Ability

The probability of winning on a slot machine is 5%. If a person plays the machine 500 times, find the probability of winning 30 times. Use the normal approximation to the binomial distribution.

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Im unclear how to figure this out. Can you break down each step for me. (-6,5) and has a slope of 7/3

I just want to make sure im doing this correct. The question asks. Write an equation, in slope-intercept form when possible Find the domain of f, the roots of f(x)=0, and determine the signs of f where

f(x)= x^2-1/sqrt x+1 + sqrt x+1