exam Maths Puzzle Numerical Ability

Factor polynomial by factoring out GCF. 2a^2-4ab^2-ab

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exam Other Question

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.
determine the equation of each line. Write the answer in standard form using only integers as the coefficients.

The line through (-2,0) with slope -3/4. (the negative sign next to the 3/4 is in the middle of the 3 and 4 next to the divide line)