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CaHeK987 [17]
2 years ago
9

How many values of x must be excluded in the expression (x - 2) / (x + 9) (x - 5) ?

Mathematics
2 answers:
Alecsey [184]2 years ago
6 0

C. 2

the 1x in the numerator position would "cancel out" 1 of the x's in the denominator (this description makes more sense if you viewed the entire problem written out as a fraction)

Andreas93 [3]2 years ago
4 0

Answer:  The correct option is (C). 2.

Step-by-step explanation: We are given to find the number of value of x that must be excluded in the expression  below:

E=\dfrac{x-2}{(x+9)(x-5)}.

We have to exclude those values of x for which the expression E becomes undefined.

Since E is a rational expression, so the becomes undefined only when the denominator becomes 0.

That is,

(x+9)(x-5)=0\\\\\Rightarrow x+9=0~~~~~~~~x-5=0\\\\\Rightarrow x=-9,~~~~~~~~\Rightarrow x=5.

Therefore, we need to exclude the values x = -9  and  x =5.

So, there are two values of x to be excluded from the given expression.

Thus, the number of values of x to be excluded is 2.

Option (C) is CORRECT.

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Answer: It costs $1.22 to make each paperweight.

Step-by-step explanation:

Given : Selling price of 95 identical paperweights = $230.85

Then, Selling price of 1 paperweight = (Selling price of 95 identical paperweights) ÷ 95

= $ (230.85 ÷ 95) = $ 2.43

Now, selling price of each paperweight = 2 x ( cost of each paperweight)

⇒ cost of each paperweight = (selling price of each paperweight ) ÷ 2

⇒ cost of each paperweight = $ 2.43 ÷ 2 = $ 1.215 ≈ $ 1.22

Hence, it costs $1.22 to make each paperweight.

6 0
3 years ago
Which of the following is NOT a valid definition of a derivative?
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Answer:

C. f'(x) = lim(h→0) [(f(x+h) − f(x)) / h]

Step-by-step explanation:

The first derivative is the slope between two points as the distance between those points approaches 0.  Slope is Δy/Δx.  Choice D is a valid way to write the first derivative.  It is the slope between the points (x, f(x)) and (x+h, f(x+h)).  Choice C is not a valid definition.

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Liam has a points card for a movie theater.
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The  number of visits Liam can make to earn his first free movie ticket is: 8.4.

<h3>Number of visits Liam can make</h3>

Let x represent the number of visits

Formula
55+12.5×x=160

Re-arrange

12.5x=160-55

12.5x=105

Divide both side by 12.5x

x=105/12.5

x=8.4 visits

Therefore the  number of visits Liam can make to earn his first free movie ticket is: 8.4.

Learn more about Number of visits Liam can make here:brainly.com/question/18350673

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1 year ago
You are trying to bulk and gain muscle. Your trainer says your daily calorie intake should increases based on hours you spend ex
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a) T - Calories, 2000 - <em>Minimum</em> calories, 500 - Additional calories per exercise hour, b) We should consume 3500 calories to spend three hours exercising.

<h3>How to analyse a linear function of calorie gain in terms of the exercise time</h3>

In this question we have a <em>linear</em> function where the <em>independent</em> variable is the exercise time (h), in hours, and the <em>dependent</em> variable is the calorie gain (T), in calories. The constant "2000" is the <em>minimum</em> calorie consumption and the constant "500" represents the amount of <em>additional</em> calories per each hour of exercise.

Now we proceed to respond the questions of the part a):

(i) T - Amount of calories needed, (ii) 2000 - Minimum calorie consumption, (iii) 500 - Amount of additional calories per hour of exercise.

b) And lastly we calculate the amount of calories by evaluating the function:

T = 2000 + 500 · 3

T = 2000 + 1500

T = 3500

We should consume 3500 calories to spend three hours exercising.

<h3>Remark</h3>

The statement is incomplete, the complete form is shown below:

You are trying to bulk up and gain muscle. Your trainer says that your daily calorie intake should increase based on the hours you spend exercising and can be represented by the following equation: T = 2000 +  500 · h

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b) If you spend 3 hours exercising, how many calories should you consume?

To learn more on linear functions: brainly.com/question/21107621

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