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sasho [114]
2 years ago
6

Evaluate the expression when b= 3 and c = -4 b - 4c ​

Mathematics
1 answer:
Sedaia [141]2 years ago
5 0

Answer:

15.

c is a negative

3 - (-12)

15

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If in a sample of 355 adult males, we have a mean total cholesterol level of 185 mg, with s = 16. What is the 95% confidence int
sladkih [1.3K]

Answer:

Step-by-step explanation:

We want to determine a 95% confidence interval for the mean total cholesterol level of all males.

Number of sample, n = 355

Mean, u = 185 mg

Standard deviation, s = 16

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

Confidence interval

= mean +/- z ×standard deviation/√n

It becomes

185 +/- 1.96 × 16/√355

= 185 +/- 1.96 × 0.849

= 185 +/- 1.66404

The lower end of the confidence interval is 185 - 1.66404 =183.336

The upper end of the confidence interval is 185 + 1.66404 = 186.66

Therefore, with 95% confidence interval, the mean total cholesterol level of all males is between 183.336 mg and 186.66 mg

5 0
3 years ago
Answer this one please!
Scilla [17]
Using simultaneous equation,

a=-1, b=1, x=1, y=0
OR
a=1, b=-1, x=1, y=0.
6 0
2 years ago
suppose the temperature outside is dropping 2.5 degrees each hour how much will the temperature change in 6 hours​
mote1985 [20]

Answer:

15 degrees

Step-by-step explanation:

2.5x6= 15

8 0
3 years ago
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Which equation matches the graph of the absolute value function seen here?
nignag [31]

use a calculator instead of asking

7 0
3 years ago
What is the fraction 18/24 reduced to its lowest terms?
WINSTONCH [101]
<em>First, find the greatest common factor (GCF) of the numerator and denominator.</em>

<u>Factors of 18</u>: 1, 2, 3, 6, 9, 18
<u>Factors of 24</u>: 1, 2, 3, 4, 6, 8, 12, 24
<u>Common Factors</u>: 1, 2, 3, 6
<u>GCF</u>: 6

<em>Now, divide the numerator by 6 and the denominator by 6.</em>

18 ÷ 6 = 3
24 ÷ 6 = 4

<em>Set these as your new numerator and denominator.</em>

\frac{3}{4}

The answer is (b).

8 0
3 years ago
Read 2 more answers
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