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KATRIN_1 [288]
3 years ago
5

The graph shows the relationship between the total cost and the number of erasers bought at the student store. Which statement i

s true?
Mathematics
1 answer:
MrMuchimi3 years ago
8 0
Seven erasers cost $3.50

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Answer:

t_a = 7 s

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Step-by-step explanation:

Given:

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Solution:

- Lets time taken by stone to drop through air as t_a = t_a.

- The time taken in water would be t_w = (12 - t_a)

- The total distance covered can be calculated as:

                            D = v_a*t_a+ v_w*(12 - t_a)

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Simplify and solve for t:

                            91 = 16*t_a - 3t_a

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                            t_a = 7 s

                            t_w = 5 s

                           

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