book Maths Puzzle Numerical Ability

Each week a maid service cleans x houses at $60/ house. The cost to the maid service for cleaning each house is $40.00. Write an equation that relates the monthly profit, in doll

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book Other Question

rewrite the equation so that y is a function of x solve for y

7x+y=13 Mika leaves Boston for Baltimore at 10:00 A.M., traveling at
45mi/h. One hour later, Hiroko leaves Baltimore for Boston on the same route, traveling at 50mi/h. If the two cities are 425 mi apart, when will Mika and Hiroko meet?