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ludmilkaskok [199]
3 years ago
8

What is 2x + 15 = 2x − 15

Mathematics
1 answer:
andriy [413]3 years ago
3 0

2x+15=2x-15

Subtract 2x from both sides

2x+15-2x = 2x-15-2x

15=-15

Subtract 15 from both sides

15-15= -15-15

0= -30

Answer : There are no solutions


I hope that's help !

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Please help me. There are 25 students in Mrs. Benatar‘s class at the beginning of the school year, and the average number of sib
adelina 88 [10]

Answer: 3.19

Step-by-step explanation:

So to find the average I used a simple but pretty effective method

3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+8/26=3.1923

So the new average is 3.19

8 0
3 years ago
g People between the ages of 65 and 70 were studied to see if those who exercise more were healthier. One measure of health was
liubo4ka [24]

Answer:

If the person selected had high blood pressure, the probability that he or she did not exercise is P=0.643.

Step-by-step explanation:

We have a group of people between agss of 65 and 70.

They are divided in two groups regarding their amount of exercise: "none", "moderate" and "high".

The response variable is blood pressure, that was categorized as "normal"or "high".

Then,  we have the frequencies table as:

Amount of exercise          None    Moderate    High

Blood pressure High          54              23            7

Blood pressure Normal      86              76            32

We have to calculate the probability that, given that the person had high blood pressure, he or she did not exercise.

If the person had high blood pressure, it can be of the any of the 3 groups of exercise amount. There are 54 people with high blood pressure that did not exercise, 23 that did moderate amount of exercise, and 7 that did a high amount.

Then, the probability can be calculated dividing the amount of people that had high blood pressure and did not exercise, by all the people that have high blood pressure (regarding the amount of exercise):

P(N | HP)=\dfrac{54}{54+23+7}=\dfrac{54}{84}=0.643

If the person selected had high blood pressure, the probability that he or she did not exercise is P=0.643.

5 0
3 years ago
Given the arithmetic sequence an=4-4(n-1), what is the domain for n?
m_a_m_a [10]

The domain for n is  -\infty

Explanation:

The arithmetic sequence is    

To determine the domain of the sequence, let us consider  a_n as  f(n)  

Thus, the sequence becomes,  f(n)=4-4(n-1)  

The domain of the function is the set of all x-values for which the function is real and well defined.

Since, the function has no domain constraints or undefined points. Therefore, the domain of the function is

Thus, the domain of the arithmetic sequence  a_n=4-4(n-1) is  -\infty

 

4 0
3 years ago
A function is expressed by the formula y = 2x + 7. Find the value of y if x is equal to 1; -20; 43.
rosijanka [135]

Answer:

when x = 1 then y = 9

when x = -20 then y = -33

when x = 43 then y = 93

Step-by-step explanation:

Just replace the given values of x ( which are 1 , -20 , 43 ) in the function

3 0
3 years ago
I need help with this
AnnyKZ [126]

Answer:

Step-by-step explanation:

64

8 0
3 years ago
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