exam Maths Puzzle Numerical Ability

kaylene is 30 yrs. old and jessica is 22 yrs. old. how many years ago was kaylene twice as old as jessica?

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exam Other Question

Given f(x)=1/3x+1
a. the domain
b. f(1)
c. f(1)-f(2)
d. f(1)-f(2)/3 For the function f(x)= -3x^2 + x- 11, determine the difference quotient
f(a+h) - f(a)/h where h is not equal to 0. Simplify your result as much as possible.