book Maths Puzzle Numerical Ability

A population increased to P0e4 in the first four years. What is the growth rate of this population? [Hint: P(t) = P0ekt]

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book Other Question

find an equation for a circle satisfying the given conditions

center(6,-5) passes through (1,7)
1 Eliminate, x,y between the following equations
x^2-y^2=px-qy, 4xy=qx+py , x^2+y^2=1

2. Eliminate, x,y,z between equations
y/z - z/y = a , z/x -x/z = b , x/y - y/x =c