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Alinara [238K]
3 years ago
10

Write a quadratic equation in standard form that has two solutions, 9 and -2

Mathematics
1 answer:
guapka [62]3 years ago
3 0
(x - 9)(x + 2) = 0
x^2 + 2x -9x -18 = 0
x^2 - 7x - 18 = 0
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The Chang family is on their way home from a cross-country road trip. During the trip, the function D (t) = 3260 - 55t can be us
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Answer:

See below.

Step-by-step explanation:

D(t) = 3260 - 55t

The function that shows their distance from home as a function of time shows that they started 3260 miles from home and are driving at 55 miles per hour.

part a:

D(12) = 3260  55(12)

D(12) = 3260 - 660

D(12) = 2600

Interpretation: After 12 hours of driving home, they are 2600 miles from home.

part b:

D(t) = 2490

3260 - 55t = 2490

-55t = -770

t = 14

Interpretation: When they are 2490 miles from home, they have driven for 14 hours.

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