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2 years ago

What are double facts what do they look like

Mathematics

2 answers:

motikmotik2 years ago

7 0

Double facts the even and odd numbers for example 2×2=4

Taya2010 [7]2 years ago

6 0

Double facts are like this, 55, But if your looking for the PROBLEMS then it is

55 - 45. I hope this helps! if it does please make this the "brainliest" Answer!

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Find the approximate side length of a square game board with an area of 186in2

Arturiano [62]

13.6in is the answer

8 0

3 years ago

Read 2 more answers

A random sample of 64 students at a university showed an average age of 20 years and a sample standard deviation of 4 years. The

adelina 88 [10]

Answer:

The 90% confidence level is $19.15< L < 20.85$

Step-by-step explanation:

From the question we are told that

The sample size is $n = 64$

The mean age is $\= x = 20 \ years$

The standard deviation is $\sigma = 4 \ years$

Generally the degree of freedom for this data set is mathematically represented as

$df = n - 1$

substituting values

$df = 64 - 1$

$df = 63$

Given that the level of confidence is 90% the significance level is mathematically evaluated as

$\alpha = 100 - 90$

$\alpha =$ 10 %

$\alpha = 0.10$

Now $\frac{\alpha }{2} = \frac{0.10}{2} = 0.05$

Since we are considering a on tail experiment

The critical value for half of this significance level at the calculated degree of freedom is obtained from the critical value table as

$t_{df, \frac{ \alpha}{2} } = t_{63, 0.05 } = 1.669$

The margin for error is mathematically represented as

$MOE = t_{df , \frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }$

substituting values

$MOE = 1.699 * \frac{4 }{\sqrt{64} }$

$MOE = 0.85$

he 90% confidence interval for the true average age of all students in the university is evaluated as follows

$\= x - MOE < L < \= x + E$

substituting values

$20 - 0. 85 < L < 20 + 0.85$

$19.15< L < 20.85$

4 0

3 years ago

Find the measurement of the arc

Lapatulllka [165]

Answer:

146°

Step-by-step explanation:

the measure of an arc that sees the core of the circle is equal to the angle its sees.

6 0

2 years ago

The altitude of an equilateral triangle is 22 inches. Find the perimeter of the equilateral triangle. Leave answer as a simplifi

torisob [31]

The perimeter of the equilateral triangle will be 76.2 in

Explanation:

Altitude of an equilateral triangle, H = 22 in

Perimeter, p = ?

Let a be the side of the triangle

We know:

$H = \frac{a\sqrt{3} }{2} \\\\22 = \frac{a\sqrt{3} }{2} \\\\a = 25.4 in$

Perimeter = 3a

P = 3 X 25.4 in

P = 76.2 in

3 0

3 years ago

In which expression is the number 5 a factor? A. z+5 B. z-5 C.5z D.5/z

LenaWriter [7]

The correct answer is: C.5z

Further explanation:

A factor is a number that is multiplied with a number

Let us look at the options one by one

A. z+5

5 is not a factor as it is being added to z.

B. z-5

5 is not a factor as it is being subtracted from z.

C.5z

5 is a factor as it is being multiplied with the z and can be separated easily

Hence,

The correct answer is: C.5z

Keywords: Factors, Multiple Choice

Learn more about factors at:

#LearnwithBrainly

4 0

3 years ago