Open Up - Grade 7 - Mathematics - Unit 5 - Lesson 10

30 + -30 = 0.Write another sum of two numbers that equals 0.

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30 + -30 = 0.Write a sum of three numbers that equals 0.

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30 + -30 = 0.Write a sum of four numbers that equals 0, none of which are opposites.

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A submarine is searching for underwater features. It is accompanied by a small aircraft and an underwater robotic vehicle.At one time the aircraft is 200 m above the surface, the submarine is 55 m below the surface, and the underwater robotic vehicle is 227 m below the surface.What is the difference in height between the submarine and the aircraft?

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A submarine is searching for underwater features. It is accompanied by a small aircraft and an underwater robotic vehicle.At one time the aircraft is 200 m above the surface, the submarine is 55 m below the surface, and the underwater robotic vehicle is 227 m below the surface.What is the distance between the underwater robotic vehicle and the submarine?

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Clare is cycling at a speed of 12 miles per hour. If she starts at a position chosen as zero, what will her position be after 45 minutes?

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Han is cycling at a speed of -8 miles per hour;If he starts at the same zero point, what will his position be after 45 minutes?

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Clare is cycling at a speed of 12 miles per hour.Han is cycling at a speed of -8 miles per hour;What will the distance between them be after 45 minutes?

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