exam Maths Puzzle Numerical Ability

Factor completely
a. 4b^2 +3b - 10
b. -5g^2 + 2g + 16

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exam Other Question

Solve with exact solutions
log2(x)-log2(3x-1)=0

I only got this far
logbase2(x/3x-1) birth weights are normally distributed with the mean of 3570g and a standard deviation of 495g. if a hospital wants to watch carefully the lightest 2% of infants, find the weight that seperates the bottom 2% from others.