exam Maths Puzzle Numerical Ability

F(t)=t^2+4t
-Determine the domain of each function.

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exam Other Question

Which equation best models the data:
x:-2,0,2,4
y: 3.5,7,14,28
a) y=3.5(2)^(x/2)
b) y=3.5(2)^x
c) y=7(2)^(x/2) or
d) y=7(2)^x ???? Factor the polynomial of 5x^2-125