exam Maths Puzzle Numerical Ability

Jorge bought s 40 cent stamps and three times as many 25 cent stamps. How many dollars did he spend?

.40s +3s(.25)= x

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exam Other Question

How do you find a domain and range of a graphed vertical line test once you know its a function? Find the center and vertices for the hyperbola given by the equation x^2/7-y^2/25=1