exam Maths Puzzle Numerical Ability

I need o find the domain for
f(t)=4.5e^t

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exam Other Question

y + 7 for y = 4 How do I write a formula to evaluate the polynomial at the points x = -2 and y= -3 for the following 1-x^2y+6xy^2-x^3y^3+12y^5
Your help is greatly appreciated!!