exam Maths Puzzle Numerical Ability

3x+3y+z=21
x-3y+2z=-5
8x-2y+3z=24

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exam Other Question

Vertex (h,k) of the quadratic functionf(x)=a(x-h)^2+k is (1,2) and the y intercept is (0,1)
find the quadratic function
what is the maximum value of the function? Which of the following is a logarithmic function?
a. f(x) = x^2
b. L(t) = 1 - e^-t
c. g(q) = q^-2
d. R(x) = 4 ln(x)