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mezya [45]
3 years ago
7

Solve for z −4z + 31 ≥ 17z + 23

Mathematics
2 answers:
mojhsa [17]3 years ago
6 0

Answer:

z ≤ 8/21

​

Step-by-step explanation:

Flip the inequality sign since you are multiplying by a negative number

 21z-8  ≤ 0

1.2    Divide both sides by  21  

 z-(8/21)  ≤ 0

Add  8/21  to both sides

z ≤ 8/21

Natali [406]3 years ago
3 0

z  \leqslant  \frac{8}{21}

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alekssr [168]
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3 years ago
PLZ HELP ASAP 20 POINTS
Sonbull [250]

Answer:

a).no sugar=1. flour=3 1/2

B). sugar= 1 1/2. Flour= 5 1/4

c) your just simplifying to the smallest possible number

Step-by-step explanation:

1/2 doubled= 1 (1/2+1\2)

1 3/4= 7/4

7/4 doubled= 14/4=3 2/4= 3 1/2(1 1/3+1 1/3)

5 0
2 years ago
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2. P337. 23. A large box contains 10,000 ball bearings. A random sample of 120 is chosen. The sample mean diameter is 10 mm, and
Rashid [163]

Answer:

B is True

A, C. D are false

Step-by-step explanation:

Given :

Sample size, n = 120

Mean diameter, m = 10

Standard deviation, s = 0.24

Confidence level, Zcritical ; Z0.05/2 = Z0.025 = 1.96

The confidence interval represents how the true mean value compares to a set of values around the mean computed from a set of sample drawn from the population.

The population here is N = 10000

To obtain

Confidence interval (C. I) :

Mean ± margin of error

Margin of Error = Zcritical * s/sqrt(n)

Margin of Error = 1.96 * 0.24/sqrt(120)

Confidence interval for the 10,000 ball bearing :

10 ± 1.96 * (0.24) / sqrt(120)

Hence. The confidence interval defined as :

10 ± 1.96 * (0.24) / sqrt(120) is the 95% confidence interval for the mean diameter of the 10,000 bearings in the box.

4 0
2 years ago
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Savatey [412]
Hey there! :D

Since all the terms are being added together, and there is a common denominator with the fractions, we can just add them.

x+x= 2x  3/4+2/4= 5/4

2x+5/4

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I hope this helps!
~kaikers
7 0
3 years ago
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Dafna1 [17]
They have a scale factor of 5:6 so first we need to find the perimeter of KLM:
11 + 14 + 17 = 42
Then apply the scale factor of 5:6:
\frac{5}{6}  =  \frac{x}{42}
Set the denominators equal:
\frac{35}{42}  =  \frac{x}{42}
So we see that the perimeter of GHJ is 35.
6 0
3 years ago
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