Open Up - Grade 7 - Mathematics - Unit 7 - Lesson 4

Which equation represents the relationship between the angles in the figure?

• 88 + b = 90
• 88 + b = 180
• 2b + 88 = 90
• 2b + 88 = 180

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7.G.5

Segments AB, EF, and intersect at point c, and angle ACD is a right angle. Find the value of .

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7.G.5

Select all the expressions that are the result of decreasing x by 80%.

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7.G.5

Andre is solving the equation 4(x+\frac{3}{2}) = 7. He says, “I can subtract \frac{3}{2} from each side to get 4x = \frac{11}{2} and then divide by 4 to get x =\frac{11}{8}.” Kiran says, “I think you made a mistake.”How can Kiran know for sure that Andre’s solution is incorrect?

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7.G.5

Andre is solving the equation 4(x+\frac{3}{2}) = 7. He says, “I can subtract \frac{3}{2} from each side to get 4x = \frac{11}{2} and then divide by 4 to get x =\frac{11}{8}.” Kiran says, “I think you made a mistake.”Describe Andre’s error and explain how to correct his work.

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7.G.5

A train travels at a constant speed for a long distance. Write the two constants of proportionality for the relationship between distance traveled and elapsed time.

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7.G.5