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7th Grade Math Topic 1 Review
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Javier had $305 in his bank account. His bank charges a fee of $7.50 each month. If he makes no other deposits or withdrawals, how much money is in Javier’s account at the end of three months?
305 - 7.50(3) = $282.50
What is an irrational number?
A number that never terminates or repeats.
What is a rational number?
A number that either terminates or repeats
Carl and Cameron are at a pool. Carl dives in and touches the bottom of the pool, 15 feet below the surface. Cameron is standing on a diving platform 2 feet above the surface. What is the distance between Carl’s hand and Cameron’s feet?
17
An astronaut is returning to Earth in a spacecraft. If the spacecraft is descending at a rate of 13.81 kilometers per minute, what will be its change in height after 5 1/2 minutes? Round your answer to the nearest kilometer.
–76 km
A marathon is 26.2 miles long. There is a water station every 1 1/4 miles along the race route. How many water stations are needed for this marathon?
21
A catering company loses $110 as a result of a delay. The 5 owners of the company must share the loss equally. Write an expression to represent each owner's share of the loss?
–110 ÷ 5
In the first round of a card game, Niki scored 20 points. Then, she lost 10 points on one turn and an additional 25 points on her final turn. What is Niki’s final score?
-15
Andy is scuba diving. He starts at sea level and then descends 10 feet in 2 1/2 minutes. If he continues at this rate, where will Andy be in relation to sea level after 6 minutes?
-24 feet
Andy is scuba diving. He starts at sea level and then descends 10 feet in 2 1/2 minutes. Part A How would you represent Andy’s descent as a unit rate? Express your answer as an integer.
-4 feet per minute
Four out of nine dogs weigh less than 20 pounds. What is the decimal equivalent for the number of dogs weighing less than 20 pounds?
o.4444...
Arianna runs up 4 flights of stairs and then runs down 4 flights of stairs. Does this situation represent additive inverses? Explain.
Yes; The numbers combine to zero.