exam Maths Puzzle Numerical Ability

Please help...
Perform the indicated operation and write the term in the lowest terms:

3x + 3w + bx + bw over x^2 - w^2 multoplied by 6 - 2b over 9 - b^2

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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??? Thank you in advance for your help with this problem. f(x)=sqrt5x+1 I am looking for the domain. thanks again.