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elena-14-01-66 [18.8K]
3 years ago
7

What expression is equivalent to cos(1.4x)-cos(.6x)

Mathematics
1 answer:
andreev551 [17]3 years ago
6 0
The answer should be:
cos (0.8 x)

BRAINLIEST PLS!!!
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Compute the standard deviation of the following set of data to the nearest whole number:
Klio2033 [76]

Answer:

Step-by-step explanation:

The standard deviation is the square root of the variance, and the variance is found by using the mean. So we will do that first. I will use the population variance as opposed to the sample variance since our set of numbers is small.

The mean: 8 + 12 + 15 + 17 + 18 = 70 and divide that by 5 to get

\bar{x}=14 and use this to find the variance in the formula:

s^2=\frac{\sum(x_i-\bar{x})^2}{n} it is a bit difficult to enter that formula in correctly, but here's how it works mathematically:

s^2=\frac{(8-14)^2+(12-14)^2+(15-14)^2+(17-14)^2+(18-14)^2}{5}

Squaring this ensures us that we don't end up with zero, which would be useless.

s^2=\frac{36+4+1+9+16}{5} so

s^2=13.2 which means that the standard deviation is

s = 3.633

(If you do it with n-1 = 4 in the denominator of the variance, you get a standard deviation of 4.062)

3 0
2 years ago
Pls help. Which of the following numbers represents
serious [3.7K]

Answer:

89percent

Step-by-step explanation:

i am not good at math but what ever

8 0
3 years ago
MZJNM = 103°. Find mZJNK<br> 2<br> *<br> 24<br> 32<br> K<br> M<br> L
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Answer:

m<ZJNK=47°

Step-by-step explanation:

m<ZJNK=103°-24°-32°=47°

8 0
3 years ago
10. Do these figures have the same or the opposite orientation?
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Opposite

Step-by-step explanation:

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Can a triangle be drawn with the following angle measures? 45, 55, 65
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