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astra-53 [7]
3 years ago
5

What is 7x+6x because in math we are doing properties of operations and I need help with it and I don't know how to do it

Mathematics
2 answers:
julia-pushkina [17]3 years ago
5 0
You just add 6 and 7 then put the X after it. Since 7 and 6 both have an X after them you can add them because it’s considered combining like terms
Sloan [31]3 years ago
4 0

Answer:

13x

Step-by-step explanation:

7x+6x=13x. But since i do not have a second part of the question i can not tell you what x equals

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If Y = 14 inches, Z = 19 inches, H = 6 inches, and W = 4 inches, what is the area of the object?
Elza [17]

Answer:

6384

Step-by-step explanation:

14*19*6*4= 6384

area means multiply.

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3 years ago
Antonio jogs 2 laps every 5 minutes. Which point represents this relationship?
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Answer:the answer is B

Step-by-step explanation:

Easy the intergers for that point is 2,5

This is common sense

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surface area of a cone is 320 surface meters. another cone has a surface area of 20 square meters. what is the scale factor used
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I believe that the answer is 16, i believe that is the answer.
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2 years ago
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The mathematics section of a standardized college entrance exam had a mean of 19.8 and an SD of 5.1 for a recent year. Assume th
Fudgin [204]

Answer:

a) 0.84% of students scored over 32

b) 29.12% of students scored under 17​

c) 70.04% of students scored between 17 and 32.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

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

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 19.8, \sigma = 5.1

a) About what percent of students scored over 32​?

This is 1 subtracted by the pvalue of Z when X = 32. So

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

Z = \frac{32 - 19.8}{5.1}

Z = 2.39

Z = 2.39 has a pvalue of 0.9916

1 - 0.9916 = 0.0084

So 0.84% of students scored over 32

​b) About what percent of students scored under 17​?

This is the pvalue of Z when X = 17. So

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

Z = \frac{17 - 19.8}{5.1}

Z = -0.55

Z = -0.55 has a pvalue of 0.2912

So 29.12% of students scored under 17​

c) About what percent of students scored between 17 and 32​?

This is the pvalue of Z when X = 32 subtracted by the pvalue of Z when X = 12. So

X = 32

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

Z = \frac{32 - 19.8}{5.1}

Z = 2.39

Z = 2.39 has a pvalue of 0.9916

X = 17

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

Z = \frac{17 - 19.8}{5.1}

Z = -0.55

Z = -0.55 has a pvalue of 0.2912

0.9916 - 0.2912 = 0.7004

70.04% of students scored between 17 and 32.

5 0
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9 times 5 Times 6 Times 7 divide by 2
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