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alexgriva [62]
3 years ago
15

Amber and Austin were driving the same route from college to their home town. Amber left 2 hrs before Austin. Amber drove at an

average speed of 55 mph, and Austin averaged 75 mph per hour. After how many hours did Austin catch up with Amber?
A. 10 h
B. 7.5 h
C. 5.5 h
D. 2 h

Ps. answer B. 7.5 h is wrong. I just took the test and doing a redo.​
Mathematics
1 answer:
inna [77]3 years ago
5 0

Answer:

5.5 hours. ok 5.5 hours is correct

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Type the correct answer in the box use/ for the fraction bar
Zarrin [17]

Answer:

see explanation

Step-by-step explanation:

given the 2 equations

y = x² - 2x - 19 → (1)

y + 4x = 5 → (2)

substitute y = x² - 2x - 19 into (2)

x² - 2x - 19 + 4x = 5 ( subtract 5 from both sides )

x² + 2x - 24 = 0 ← in standard form

(x + 6)(x - 4) = 0 ← in factored form

equate each factor to zero and solve for x

x + 6 = 0 ⇒ x = - 6

x - 4 = 0 ⇒ x = 4

substitute each value of x into (1) for corresponding y- coordinate

x = - 6 : y = (- 6)² - 2(- 6) - 19 = 36 + 12 - 19 = 29 ⇒ (- 6, 29)

x = 4 : y = 4² - 2(4) - 19 = 16 - 8 - 19 = - 11 ⇒ (4, - 11)

the solutions are (- 6, 29), (4, - 11)


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2 years ago
Why can 0.825 be written as a fraction explain
ale4655 [162]

Answer:

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Hope this helps ^-^

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What is the range of f(x) = ( 3/4 ) x - 4?
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it's B

I just took the test

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