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iragen [17]
3 years ago
15

Add the two expressions. 2n−3 and −7n+2

Mathematics
2 answers:
Jet001 [13]3 years ago
8 0
Well, we're not trying to find n, necessarily, simply add the two expressions, right? So let's get the like terms together:

(2n - 7n) + (-3 + 2)

And then add to get -5n - 1
Sedaia [141]3 years ago
4 0
I think -5n-1 but i may be wrong
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Answer:

√112

Step-by-step explanation:

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Let f(x) = 1/x . Find the number b such that the average rate of change of f on the interval [2, b] is − 1/8
vekshin1

Answer:

b=4

Step-by-step explanation:

So, we have the function f(x)=1/x. We need to find b such that the average rate of change or the slope is -1/8 between the intervel [2, b]. First, let's find f(2).

f(2) = 1/(2) = 1/2

So, we have the point (2, 1/2)

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Let's plug this into the slope formula:

\frac{y_2-y_1}{x_2-x_1}=\frac{.5-\frac{1}{b} }{2-b}  =-1/8

Now, we just need to solve for b. First, let's multiply both the numerator and denominator by b (to get rid of the annoying fraction in the numerator).

\frac{.5b-1}{2b-b^2} =\frac{-1}{8}

Now, cross multiply.

4b-8=b^2-2b

b^2-6b+8=0

Solve for b. Factor using the numbers -4 and -2.

=(b-4)(b-2)=0

Thus, b=4 or b=2.

However, b=2 is not a possible solution since the interval [2,2] means nothing. Thus, b=4.

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Mariulka [41]

Answer:

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y-\left(-3y\right)\\\mathrm{Apply\:rule}\:-\left(-a\right)=a\\=y+3y\\\mathrm{Add\:similar\:elements:}\:y+3y=4y\\=4y

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3 years ago
Read 2 more answers
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