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Snezhnost [94]
2 years ago
13

NEED ASAP MATH!! 7TH GRADE

Mathematics
1 answer:
lozanna [386]2 years ago
4 0

Answer:

b

Step-by-step explanation:

You might be interested in
The sum of a number n and 4 is 10. What is the value of the sum of n and -1?
katrin [286]

Answer:

The value of the sum of n and -1=5

Step-by-step explanation:

Step 1

Get the value of n using the equation below;

The sum of n and 4 is 10 can be expressed in equation form as follows;

n+4=10...equation 1

solving for n;

n=10-4

n=6

The value for n=6

Step 2

Express the sum of n and -1 as follows

n+(-1)=unknown...equation 2

using the value of n solved in equation 1 in equation 2

replace using;

n=6

6+(-1)=6-1=5

The value of the sum of n and -1=5

5 0
3 years ago
HELP PLEASE!!!! Find x.
drek231 [11]

Answer:

x = 33

Step-by-step explanation:

these two angles are a linear pair, they form a straight line

there are 180 degrees in a straight line

so you can add each expression and have sum equal 180

2x-18 + 4x = 180

6x - 18 = 180

6x = 198

x = 33

5 0
2 years ago
The distribution of results from a cholesterol test has a mean of 180 and a standard deviation of 20. A sample size of 40 is dra
olga2289 [7]

Using the normal distribution, there is a 0.2148 = 21.48% probability that the sum of the 40 values is less than 7,100.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean \mu and standard deviation \sigma is given by:

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

  • The z-score measures how many standard deviations the measure is above or below the mean.
  • Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.
  • By the Central Limit Theorem, the sampling distribution of sample means of size n has standard deviation s = \frac{\sigma}{\sqrt{n}}.

For this problem, these parameters are given as follows:

\mu = 180, \sigma = 20, n = 40, s = \frac{20}{\sqrt{40}} = 3.1623

A sum of 7100 is equivalent to a sample mean of 7100/40 = 177.5, which means that the probability is the <u>p-value of Z when X = 177.5</u>, hence:

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

By the Central Limit Theorem:

Z = \frac{X - \mu}{s}

Z = \frac{177.5 - 180}{3.1623}

Z = -0.79

Z = -0.79 has a p-value of 0.2148.

There is a 0.2148 = 21.48% probability that the sum of the 40 values is less than 7,100.

More can be learned about the normal distribution at brainly.com/question/28135235

#SPJ1

5 0
2 years ago
A dress has a thirty percent discount applied and is on sale for 63 pound. What was the original price of the dress before the r
jekas [21]

Answer:

£90

Step-by-step explanation:

7 0
3 years ago
What is the product?
Eddi Din [679]

Answer:

\boxed{2 {x}^{2}  - 8x}

Step-by-step explanation:

2x(x - 4) = (2x \times x) - (2x  \times 4) \\  \\  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: = 2 {x}^{2}  - 8x

6 0
2 years ago
Read 2 more answers
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