exam Maths Puzzle Numerical Ability

two times a number plus 1 is 21

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exam Other Question

Using the following information, I must put the information in an equation in E(t)=a(1/2)^th form.

E(t)=179.2e^-0.12t and E(t)=179.2(1/2)^t/5.8

Can you help me?
Is (-1,-4) on the graph of y-2x=-2?


Thank you