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BARSIC [14]
3 years ago
14

Lilly takes a train each day to work that averages 35 miles per hour. On her way home, her train ride follows the same path and

averages 45 miles per hour. If the total trip takes 2.5 hours, which equation can be used to find n, the number of miles Lilly’s home is from her work?
Mathematics
2 answers:
Klio2033 [76]3 years ago
5 0

Answer: 2.5=\frac{n}{35}+\frac{n}{45}


Step-by-step explanation:

1. To find the equation asked, you must add the times:

t_{total}=t_1+t_2

Where t_1 is the time takes Lilly in her path to work and t_2  is the time takes Lilly in her path to home.

2. You must use the following formula of speed and solve for the time

V=\frac{n}{t}

Where n is the distance, V is the speed and t is the time.

3. You know that Lilly takes a train each day to work that averages 35 miles per hour, then, you can write the following expression:

35=\frac{n}{t_1}\\t_1=\frac{n}{35}

4. And her train ride follows the same path at 45 miles per hour:

 45=\frac{n}{t_2}\\t_2=\frac{n}{45}

5. Then, you obtain the following equation:

2.5=\frac{n}{35}+\frac{n}{45}

True [87]3 years ago
3 0

Answer: - n/35+n/45=2.5 or just 49.22

Step-by-step explanation:

use the formulas t total=t1+t2 and V=n/t

n=distance, V=speed, and t=time

35=n/t1, and t1=n/35

her train ride follows the same path at 45mph

45=n/t2, and t2=n/45, so then you get - n/35+n/45=2.5

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great rest of Black History Month! :-)  

- Cutiepatutie ☺❀❤

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fomenos

Answer:

4 bags of chocolate chips and 1 bag of walnuts.

Step-by-step explanation:

Find how many ounces are in 3 pounds:

16 oz = 1 lb

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48 oz = 3 lbs

Variable x = number of chocolate chips

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4x + 1y = 15

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Calculate the average rate of change of f(x) over the interval [-4, -1] using the formula [ BLANK ] The value of f(-1) is [BLANK
lesantik [10]
Answers:
The formula is [f(-1)-f(-4)]/[3]
The value of f(-1) is 3
The value of f(-4) is -3
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==============================================

Explanation:

For the first blank, we use the formula
[ f(b) - f(a) ]/[ b - a ]
where 'a' and 'b' are the endpoints for the x interval

In this case, a = -4 and b = -1. When you plug those values into the formula above, you get...
[ f(b) - f(a) ]/[ b - a]
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-------------------------------------------

To compute the value of f(-1), we draw a vertical line through -1 on the x axis. This vertical line crosses the diagonal function graph at the point (-1,3). The y value of this point is what we want. Plugging in x = -1 leads to y = 3. This is why f(-1) = 3
If you want, you can draw a horizontal line through (-1,3) and you'll see it touching 3 on the y axis.

-------------------------------------------

Follow similar steps as above to compute f(-4). Draw a vertical line through x = -4 on the x axis. Mark the point where the vertical line crosses the diagonal line. This point is (-4,-3). Optionally draw a horizontal line over til you hit the y axis and you'll find that y = -3 corresponds to x = -4

This is why f(-4) = -3

-------------------------------------------

We'll use the last three sections to compute the average rate of change. Everything combines together building up to this moment.

From the first part, we had the formula
[ f(b) - f(a) ]/[ b - a ]
[ f(-1) - f(-4)]/[ 3 ]

We can replace the "f(-1)" with 3 since we found that f(-1) = 3
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Doing those replacements and simplifying leads to...

[ f(-1) - f(-4)]/[ 3 ]
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So the average rate of change is 2

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