book Maths Puzzle Numerical Ability

My question says: Remember the formula 1020 sqrt P (1-.01 sqrt P)=G. If P is the population in thousands, this formula is the amount of water in gallons per minute the city needs

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book Other Question

Write each equation in slope-intercept form:
1. y + 8 = -3/4 (x + 1)
2. 4x - 2y - 8 = 2y
What is the square root of x^2 + 2y^2