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xxMikexx [17]
4 years ago
6

Write an equation for the description. The difference between a number x and 18 is 23.

Mathematics
1 answer:
Rina8888 [55]4 years ago
7 0
X-23=18

Because difference means subtract
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Look at the PDF then answer the questions -3-
Nady [450]

part a- x + 3.25 x + 3.25 3x - 2 3x - 2 3x - 2

part b- 21x

part c- 7.75

4 0
4 years ago
Read 2 more answers
A college-entrance exam is designed so that scores are normally distributed with a mean of 500 and a standard deviation of 100.
yawa3891 [41]

Answer:

The probability is  0.003

Step-by-step explanation:

We know that the average \mu is:

\mu=500

The standard deviation \sigma is:

\sigma=100

The Z-score is:

Z=\frac{x-\mu}{\sigma}

We seek to find

P(x800)

For P(x>800) The Z-score is:

Z=\frac{x-\mu}{\sigma}

Z=\frac{800-500}{100}

Z=3

The score of Z = 3 means that 800 is 3 standard deviations from the mean. Then by the rule of the 8 parts of the normal curve, the area that satisfies the conficion of 3 deviations from the mean has percentage of 0.15%

So

P(x>800)=0.15\%

For P(x<200) The Z-score is:

Z=\frac{x-\mu}{\sigma}

Z=\frac{200-500}{100}

Z=-3

The score of Z = -3 means that 200 is 3 standard deviations from the mean. Then by the rule of the 8 parts of the normal curve, the area that satisfies the conficion of 3 deviations from the mean has percentage of 0.15%

So

P(x

Therefore

P(x800)=P(x800)

P(x800)=0.0015 + 0.0015

P(x800)=0.003

6 0
3 years ago
Mark has $18.00. What is the greatest number of days he can rent a bicycle? 2d=18 where d represents the number of days of the r
aksik [14]

Answer:

9

Step-by-step explanation:

9x2 is 18, so he can rent a bike for nine days if the rent is $2

6 0
3 years ago
A
Alex
You would beee to do 20/0.8 which would give you 25 water stations in total.
Hope that helped
6 0
2 years ago
Where would parenthesis need to be placed in the expression to get a value of 44?
Ivan

Answer:

B. 2 + (3^2 * 5) - 3

Step-by-step explanation:

Hey! Sorry for the long wait, I'm still in school and can't really be here 24/7 but I'm proud to announce that I have your answer!

So we have 4 expressions and we need to get our answer to 44. This question already includes the notion that parenthesis placements make a huge difference, so let's review them.

<h2>A.</h2>

2 + 3^2 * (5 - 3)

Use PEMDAS

2 + 3^2 * 2

2 + 9 * 2

2 + 18

20

<h2>B.</h2>

2 + (3^2 * 5) - 3

2 + (9 * 5) - 3

2 + 45 - 3

47 - 3

44

<h2>C.</h2>

(2 + 3^2) * 5 - 3

(2 + 9) * 5 - 3

11 * 5 - 3

55 - 3

52

<h2>D.</h2>

(2 + 3)^2 * 5 - 3

(5)^2 * 5 - 3

25 * 5 - 3

125 - 3

122

As we can see, B. is our answer due to its equivlance to 44.

8 0
3 years ago
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