exam Maths Puzzle Numerical Ability

Write a system of two equations in two unknown for each problem. Solve each system by substitution.

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exam Other Question

I am working on exponentaial functions and graphing. Can you help me plot the graph of the following functions?
1. f(x)=6x
2. f(x)=(1/2)^x Allen bought 21 stamps in 37-cent and 20-cent denominations. If the total cost of the stamps was $7.26, how many 37-cent stamps did Allen buy?