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3 years ago

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PLEASE HELP!! Which steps can be used to solve 6/7x+1/2=7/8 for x? Check all that apply. A. Divide both sides of the equation by

7/8 B. subtract 1/2 from both sides of the equation C. use the LCD of 2 to combine like terms D. divide both sides by 6/7 E. multiply both sides by 7/6

2 answers:

Dimas [21]3 years ago

7 0

Answer:

The correct options are:

B. subtract 1/2 from both sides of the equation.

D. Divide both sided by 6/7

E. multiply both sides by 7/6

Step-by-step explanation:

Consider the provided equation.

$\frac{6}{7}x+\frac{1}{2}=\frac{7}{8}$

Subtract 1/2 from both sides of the equation.

$\frac{6}{7}x+\frac{1}{2}-\frac{1}{2}=\frac{7}{8}-\frac{1}{2}$

$\frac{6}{7}x=\frac{3}{8}$

Multiply both the sides by 7/6.

$\frac{6}{7}x\times \frac{7}{6}=\frac{3}{8}\times \frac{7}{6}$

$x=\frac{7}{16}$

Now consider the provided options.

Hence, the correct options are:

B. subtract 1/2 from both sides of the equation.

D. Divide both sided by 6/7

E. multiply both sides by 7/6

2 years ago

edge 2020

Anon25 [30]3 years ago

5 0

Answer:

B. first step

6/7x=7/8-1/2

c. second step

6/7x=7/8-4/8=3/8

d. and e are the same

x=3/8x7/6

Step-by-step explanation:

2 years ago

wrong

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EXPONENTS:<br> What is the value of 7 cubed?<br> A. 14<br> B. 21<br> C. 49<br> D. 343

quester [9]

Answer:

C

Step-by-step explanation:

7*7=49

6 0

3 years ago

Read 2 more answers

Suppose the test scores for a college entrance exam are normally distributed with a mean of 450 and a s. d. of 100. a. What is t

svet-max [94.6K]

Answer:

a) 68.26% probability that a student scores between 350 and 550

b) A score of 638(or higher).

c) The 60th percentile of test scores is 475.3.

d) The middle 30% of the test scores is between 411.5 and 488.5.

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:

$\mu = 450, \sigma = 100$

a. What is the probability that a student scores between 350 and 550?

This is the pvalue of Z when X = 550 subtracted by the pvalue of Z when X = 350. So

X = 550

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

$Z = \frac{550 - 450}{100}$

$Z = 1$

$Z = 1$ has a pvalue of 0.8413

X = 350

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

$Z = \frac{350 - 450}{100}$

$Z = -1$

$Z = -1$ has a pvalue of 0.1587

0.8413 - 0.1587 = 0.6826

68.26% probability that a student scores between 350 and 550

b. If the upper 3% scholarship, what score must a student receive to get a scholarship?

100 - 3 = 97th percentile, which is X when Z has a pvalue of 0.97. So it is X when Z = 1.88

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

$1.88 = \frac{X - 450}{100}$

$X - 450 = 1.88*100$

$X = 638$

A score of 638(or higher).

c. Find the 60th percentile of the test scores.

X when Z has a pvalue of 0.60. So it is X when Z = 0.253

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

$0.253 = \frac{X - 450}{100}$

$X - 450 = 0.253*100$

$X = 475.3$

The 60th percentile of test scores is 475.3.

d. Find the middle 30% of the test scores.

50 - (30/2) = 35th percentile

50 + (30/2) = 65th percentile.

35th percentile:

X when Z has a pvalue of 0.35. So X when Z = -0.385.

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

$-0.385 = \frac{X - 450}{100}$

$X - 450 = -0.385*100$

$X = 411.5$

65th percentile:

X when Z has a pvalue of 0.35. So X when Z = 0.385.

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

$0.385 = \frac{X - 450}{100}$

$X - 450 = 0.385*100$

$X = 488.5$

The middle 30% of the test scores is between 411.5 and 488.5.

7 0

3 years ago

What is one point six multiplied by 4

zheka24 [161]

1.6 6x4=24
x4
____
6. 4
2
don't know if u get it but here u go

6 0

3 years ago

My answers were wrong please help

ValentinkaMS [17]

Answer:

from the top down

y=7

y=4

y=3

y=4

y=7

Step-by-step explanation:

y=(-2)²+3

y=4+3

y=7

y=(-1)²+3

y=1+3

y=4

y=0²+3

y=0+3

y=3

y=1²+3

y=1+3

y=4

y=2²+3

y=4+3

y=7

hope this helps :)

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3 years ago

What is the sum in the simplest from , 4 1/2 + 1 3/5

noname [10]

Answer:

Convert the mixed numbers to improper fractions, then find the LCD and combine.

Exact Form:

61 / 10

Decimal Form:

6.1

Mixed Number Form:

6 1/10

4 0

3 years ago