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2 years ago

BRAINLIEST!!! 2. Use the unit circle to find the value of cot (–90°).

Mathematics

1 answer:

Sholpan [36]2 years ago

3 0

Answer:

cot(- 90)° = 0

Step-by-step explanation:

Using the identity

cot x = $\frac{cosx}{sinx}$ , then

cot(- 90)° = $\frac{cos(-90)}{sin(-90)}$ = $\frac{0}{-1}$ = 0

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Four times a number added to seven times the number equals 55

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2 years ago

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Anna71 [15]

0.9874 the greatest non zero place is 9 but the nearest digit is 8 when you round it off to 0.9 the answer becomes 1.0
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2 years ago

Suppose the test scores of students in a class are normally distributed with a mean of 86 and a standard deviation of 4. What is

WARRIOR [948]

Answer:

-2.5

Step-by-step explanation:

Here in this question, we are interested in calculating the z-score for a student that had a particular mark at the test

To calculate the z-score, we need to use a mathematical formula

Mathematically;

z-score = (x - mean)/SD

From the question;

x = 76

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Plugging these values in the equation, we have;

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2 years ago

What is the simplified form of 2/x^2-x - 1/x?

Pachacha [2.7K]

Answer: $\bold{(C)\ \dfrac{3 - x}{x(x-1)}}$

<u>Step-by-step explanation:</u>

$\dfrac{2}{x^2-x}-\dfrac{1}{x}$

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$=\dfrac{2}{x(x-1)}+\dfrac{-1}{x}\bigg(\dfrac{x-1}{x-1}\bigg)$

$=\dfrac{2}{x(x-1)}+\dfrac{-x+1}{x(x-1)}$

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2 years ago

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Margaret [11]

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Hope that helps? Sorry if it doesn’t...

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