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mestny [16]
2 years ago
6

Verify the -(-x) = x for x= -21/31​

Mathematics
1 answer:
aliina [53]2 years ago
6 0

Answer:

-3

Step-by-step explanation:

because of the root

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Please help me with those 2 question!
posledela

Answer:

1

Step-by-step explanation:

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3 years ago
What is the opposite of 3.5? Write your answer as a decimal
alisha [4.7K]
The opposite of 3.5 is -3.5
3 0
2 years ago
Here are the first three terms of a different sequence.
densk [106]

Step-by-step explanation:

everything can be found in the picture

6 0
3 years ago
Variance is: Multiple Choice the average squared deviations about the mean of a distribution of values. an empirically testable
DENIUS [597]

Multiple choice answers are clearly defined as below for clarity:

A. the average squared deviations about the mean of a distribution of values.

B. an empirically testable statement that is an unproven supposition developed in order to explain certain phenomena.

C. the error made by rejecting the null hypothesis when it is true.

D. a statement that asserts the status quo; that is, any change from what has been thought to be true is due to random sampling order.

E. a statement that is the opposite of the null hypothesis

Answer:

A. The average squared deviations about the mean of a distribution of values.

Explanation:

A. the average squared deviations about the mean of a distribution of values. Correct

Standard deviation is how data is distributed around the mean. It is also the square root of the Variance. Therefore, the variance is the square of the standard deviation which is distributed around the mean.

B. an empirically testable statement that is an unproven supposition developed in order to explain certain phenomena. Incorrect

This is false as this is rather the definition for hypothesis.

C. the error made by rejecting the null hypothesis when it is true. Incorrect

This is false as this is the definition for the probability of committing a type I error

D. a statement that asserts the status quo; that is, any change from what has been thought to be true is due to random sampling order. Incorrect

This is false as this defines what a null hypothesis is.

E. a statement that is the opposite of the null hypothesis. Incorrect

The opposite of the null hypothesis is alternative hypothesis.

6 0
3 years ago
Please help i have 2 questions and the second question has 2 answer choices. thank you.
Damm [24]
Question 1:

The line segment with measure of 14 units is tangent to the circle, meaning that it is perpendicular to the radius.

Thus, we have a right triangle with legs of 14 and x and a hypotenuse of x+10.

Use the Pythagorean theorem to solve for x.

(x+10)^2=x^2+14^2

x^2+20x+100=x^2+196

Subtract both sides by x^2

20x+100=196

Subtract both sides by 100

20x=96

Divide both sides by 20

x=4.8

The third choice is your answer.

Question 2:

This question actually has 3 answers.

The answers to this question are the first, second, and fourth choice.

The first choice is correct because this is a property of a tangent line.
The second choice is also correct because this is also a property of the tangent line.
The third choice is incorrect because the tangent line only intersects the radius at the end of the radius.
The fourth choice is correct because that's what a tangent is.
The fifth choice is incorrect because that's actually a property of a secant, not a tangent.
The last choice is incorrect because there are infinitely many lines tangent to a single circle.
3 0
3 years ago
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