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katovenus [111]
3 years ago
8

Julie recently drove to visit her parents who live 120 miles away. On her way there her average speed was 20 miles per hour fast

er than on her way home (she ran into some bad weather). If Julie spent a total of 5 hours driving, find the two rates.
Mathematics
1 answer:
mart [117]3 years ago
5 0
40mph average there totaling 3 hours, 60mph back, totaling 2 hours. 5 hours total.
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otez555 [7]

Answer:

1 ± √47

Step-by-step explanation:

Combine like terms in 2x^2 +3 x-7 =x^2 +5x +39:

2x^2 - x^2 = x^2 (first term);

3x - 5x = -2x (second term);

-7 - 39 = -46 (third term)

Then we have, all on the left side, x^2 - 2x - 46, which is a quadratic equation.  Here the coefficients are a = 1, b = -2 and c = -46.

Then the discriminant, b^2 - 4ac, is:

(-2)^2 - 4(1)(-46) = 4 + 184.

The roots are:

     -(-2) ±√188         2 ± √4√47

    ------------------- = -------------------

              2                         2

                             = 1 ± √47 (last of the answer choices)

=

x = ------------------

3 0
4 years ago
If you take 3 apples from 10 apples how many apples do you have
Gnom [1K]

Answer:

7

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5 0
3 years ago
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Answer:

z=\frac{x}{y}

Step-by-step explanation:

<u><em>The complete question is</em></u>

James has to buy juice for his class party. there are several brands of juice at the store, and each container is a different size and price. write a formula that will help James find the price per milliliter for each brand.

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7 0
3 years ago
Please Help Quickly!!!<br><br> Find the limit if f(x) = x^3
jeka94

Answer:

Option b. 12

Step-by-step explanation:

This exercise asks us to find the derivative of a function using the definition of a derivative.

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3 years ago
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