exam Maths Puzzle Numerical Ability

factor(x^2+3x-40)

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exam Other Question

Which of the following is a growth curve?
a)y=0.6^x
b)y=(2/3)^-x
c)y=3.5^-x
d)y=2(1/3)^x
I think the answer is (d). Can someone please confirm??? I need help with to simplify these: e^lnx^3 and e^ln x^16 thanks