A large order has been put in at a pizza place for a school event. Darren and Tyler are both quick at making pizzas. Tyler can make 5 pizzas an hour and has already made 23. Darren has made 11 and can make 9 pizzas an hour. When they both reach the same number of pizzas total they will be done. How many pizza will they have made between now and finishing, and how long will it take?

\(38 \, pizzas \, after \, 3 \, hours\)

\(39 \, pizzas \, after \, 3 \, hours\)

\(38 \, pizzas \, after \, 3 \, hours\)

\(42 \, pizzas \, after \, 3 \, hours\)

\(43 \, pizzas \, after \, 4 \, hours\)

Emily uses rechargeable batteries. One battery has already been charged 14 percent and charges at a rate of 5 percent an hour. Emily starts charging another battery that still has 10 percent of its charge left, and charges at a rate of 7 percent an hour. How long will it be until both batteries are at the same charge percentage? What percentage will they have charged?

\(24\% \, after \, 2 \, hours\)

\(20\% \, after \, 2 \, hours\)

\(21\% \, after \, 3 \, hours\)

\(25\% \, after \, 2 \, hours\)

\(24\% \, after \, 2 \, hours\)

Nick has just unplugged his fridge so it can defrost. The freezer is at 6 degrees and warms up at 4 degrees an hour. The fridge part is at 22 degrees and rises 3 degrees per hour. How many hours will it take for both the fridge and the freezer to be the same temperature? What is the temperature change in that time span?

\(70 \, degrees \, in \, 16 \, hours\)

\(65 \, degrees \, in \, 17 \, hours\)

\(75 \, degrees \, in \, 16 \, hours\)

\(69 \, degrees \, in \, 16 \, hours\)

\(70 \, degrees \, in \, 16 \, hours\)

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Algebra

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Iowa Core Mathematics

Grade 8 - Expressions & Equations

Standard 8.EE.C.8c -

Included Skills: Algebra

Analyze and solve pairs of simultaneous linear equations. Solve real-world and mathematical problems leading to two linear equations in two variables.