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jasenka [17]
3 years ago
12

Aaron tracks the time it takes him to mow lawns by writing coordinate points relating x, the time in hours it takes to mow a law

n, and y, the area of land mowed in acres. Two of his points are (3, 1.5) and (5, 2.5). Which statement describes the slope of the line through these two points?
Mathematics
2 answers:
Alika [10]3 years ago
5 0

Answer:

2 acres/hour

Step-by-step explanation:

Please share the possible answer choices.  Thank you.

If two points on this straight line graph are (3, 1.5) and (5, 2.5), then we can find the slope of this line as follows:

As we move right from x = 3 to x = 5, x (the "run") increases by 2 and y (the "rise") increases by 1.  Thus, the slope of this line is m = rise / run = 2/1, or

m = 2.

                                                                    area mowed

The units of measurement here are m = ----------------------

                                                                     time spent

and so we could conclude that the rate is 2 acres per hour.

Bad White [126]3 years ago
4 0

Answer:

The answer is B

Step-by-step explanation:

Well, the slope is 1/2 (2.5-1.5, and 5-3) But you now need to divide 1/2. This will get you 0.5 acres per hour. That is the rate.

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If N is a 3-digit integer, and the result of reversing the digits of N is the number M, what is the maximum value of N-M? Please
Lena [83]

Answer:

The maximum value of N-M will be 792

Step-by-step explanation:

For N - M to be maximum

N must be very large and M must be very small

largest 3 numbers occur in 900's and smallest 3 digit numbers occur in 100's

so we need such an N which starts with 9 and ends with 1 so that on reversing it produces a number starting with 1.

If N = 901 , M will be 109

N - M = 792

This is the largest possible value of N - M

All other values of N-M will give a smaller value than 792.

5 0
4 years ago
How do I make both these equations into a elimination equation? Look at the pic I’m very confused!
qwelly [4]

Answer:

Step-by-step explanation:

c + a = 342 ..................... <em>(1)</em>

5c + 12a = 2550 ........... <em>(2)</em>

- 5 × <em>(1)</em> + <em>(2)</em>

7a = 840

<em>a = 120</em>

<em>c</em> = 342 - 120 <em>= 222</em>

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3 years ago
If Rogério leaves the cash flow in the checking account for all needs that arise, he runs the risk of not having the money for t
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There's no question provided, however, from a business-minded perspective, this is a very wise investment that he is making. This is because he has both short and long-term plans covered for himself in any case that certain situations would arise. 
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At a farmers market, Samuel bought 3 pounds of apples for x dollars per pound and 2 bags of spinach for y dollars each. The next
ira [324]
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Because 3x+5x=8x, and 2y+3y=5y.
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I need help with pre calculus.
otez555 [7]

Question 1

<h3>Answer:  Choice A) -7</h3>

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

Explanation:

To compute f(g(2)), we'll first need to find g(2).

Locate 2 in the x row. Then read straight down until you get to the g(x) row. You should find that g(2) = 4

This means f(g(2)) becomes f(4). We then repeat the same process as before. Locate 4 in the x row, read straight down til you get to the f(x) row to find that f(4) =  -9

Overall, we can say f(g(2)) = -9

We do the same set of steps to compute g(f(-1)). You should find that f(-1) = -1 and g(f(-1)) = g(-1) = -2

Lastly, we subtract the results we got:  

f(g(2)) - g(f(-1)) = -9 - (-2) = -9+2 = -7

==============================================

Question 2

<h3>Answer: Choice B)  0</h3>

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

Explanation:

If you were to graph each equation, you should get what you see below.

The red and blue curves do not intersect in any way. We need an intersection point to have a solution. Because there are no intersections, we don't have any solutions. The system is considered inconsistent.

==============================================

Question 3

<h3>Answer: Choice B</h3><h3>-2x^2+250x-2000</h3>

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

Explanation:

x = number of scooters made and sold

Each scooter costs $150 to make. If you made x of them, then it costs 150x dollars. Then tack on the fixed cost of $2000 to get the expression 150x+2000

The cost function is C(x) = 150x+2000. We'll subtract this from the revenue function R(x) to get the profit P(x)

\text{Profit} = \text{Revenue} - \text{Cost}\\\\P(x) = R(x) - C(x)\\\\P(x) = (400x-2x^2) - (150x+2000)\\\\P(x) = 400x-2x^2-150x-2000\\\\P(x) = -2x^2+250x-2000\\\\

==============================================

Question 4

<h3>Answer: Choice B</h3>

\left\{x\in \mathbb{R} \big| \ x \ne -2, x \ne 1\right\}

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

Explanation:

g(x) = \frac{1}{x+1}\\\\g(f(x)) = \frac{1}{f(x)+1}\\\\g(f(x)) = \frac{1}{x^2+x-3+1}\\\\g(f(x)) = \frac{1}{x^2+x-2}\\\\g(f(x)) = \frac{1}{(x+2)(x-1)}\\\\(g\circ f)(x) = \frac{1}{(x+2)(x-1)}\\\\

I started with the outer function g(x) and replaced each x with f(x) in the second step. Then I plugged in f(x) = x^2+x-3 and simplified. Factoring the denominator is helpful to determine where the denominator becomes zero. Specifically, it happens when x = -2 and x = 1. These x values must be kicked out of the domain to avoid a division by zero error.

So we start off with the real number line, and poke holes at x = -2 and x = 1.

The notation x \in \mathbb{R} means x is a real number. Then we tack on x \ne -2, x \ne 1

Overall, the domain is \left\{x\in \mathbb{R} \big| \ x \ne -2, x \ne 1\right\}

Let's see what happens if we tried plugging x = -1 into this composite function:

(g \circ f)(x) = \frac{1}{(x+2)(x-1)}\\\\(g \circ f)(-1) = \frac{1}{(-1+2)(-1-1)}\\\\(g \circ f)(-1) = \frac{1}{(1)(-2)}\\\\(g \circ f)(-1) = \frac{1}{-2}\\\\(g \circ f)(-1) = -0.5\\\\

We don't get a division by zero error, so x = -1 is allowed. The same can be said about any other x value as long as it's not -2 and not 1 either.

4 0
2 years ago
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