exam Maths Puzzle Numerical Ability

write result in scientific notation

(6 x 10^12)(3.2 x 10^8)/ (1.6 x 10^7)(3 x 10^2)

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exam Other Question

a value decreased by seven Given the function k describe by k(x) = x + 16 Find each of the following:
k(0)=
k(-15)=
k(-20)=
Help there are 3 more questions, but I am hoping to do them myself after someone explains to me how it is done please.