exam Maths Puzzle Numerical Ability

tan(11)=51/b How do i get b by itself?

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exam Other Question

the similtanious equation graph for y=x+4 and y=2x+2 Decide which is the better buy. Explain - can you please explain to me what exactly the steps are:

a 17 ounce box of cereal for $4,89 or a 21 ounce box for $5.69