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4 years ago

What decimal is equivalent to 6/8 (six-eighths)? * 20 points 6.8 0.68 7.5 0.75

Mathematics

2 answers:

Elza [17]4 years ago

8 0

Answer:

0.75 :)

Step-by-step explanation:

sergejj [24]4 years ago

3 0

The answer to this question is 0.75

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Franchise Business Review stated over 50% of all food franchises earn a profit of less than $50,000 a year. In a sample of 130 c

nydimaria [60]

Answer:

We need a sample size of 564.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$\pi = \frac{81}{130} = 0.6231$

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

Based upon a 95% confidence interval with a desired margin of error of .04, determine a sample size for restaurants that earn less than $50,000 last year.

We need a sample size of n

n is found when $M = 0.04$

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.04 = 1.96\sqrt{\frac{0.6231*0.3769}{n}}$

$0.04\sqrt{n} = 1.96\sqrt{0.6231*0.3769}$

$\sqrt{n} = \frac{1.96\sqrt{0.6231*0.3769}}{0.04}$

$(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.6231*0.3769}}{0.04})^{2}$

$n = 563.8$

Rounding up

We need a sample size of 564.

4 0

3 years ago

1. 2x = 2 - 9 21y = 4 - 6x

mina [271]

2x=2-9

21y=4-6x

2x=-7

6x=4-21y

x=-7/2

6(-7/2)=4-21y

-21=4-21y

-21-4=-21y

-25=-21y

y=-25/-21

:.y=1 4/21.

3 0

4 years ago

The scale drawing of a field in the shape of a triangle is shown below. What is the actual area in square meters, of this field?

raketka [301]

Answer:

17.5

Step-by-step explanation:

you count the squares in the triangle then each half square you add 2 meters

3 0

3 years ago

Read 2 more answers

Solve the system of equations by the substitution method.

marishachu [46]

Answer:

B. There is no solution.

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Algebra I

Solving systems of equations using substitution/elimination
Solving systems of equations by graphing

Step-by-step explanation:

Step 1: Define systems

y = x + 9x + 5

y = -x + 11x + 29

Step 2: Simplify systems

y = 10x + 5

y = 10x + 29

Step 3: Solve for x

Substitution

Substitute in y: 10x + 5 = 10x + 29
Subtract 10x on both sides: 5 ≠ 29

Here we see that 5 does not equal 29.

∴ The systems has no solutions.

Step 4: Graph systems

Check the solution set (if applicable).

We see that the 2 lines are parallel and will never intersect. Therefore, this proves that our systems has no solution.

5 0

3 years ago

Is negative three a perfect cube?

erik [133]

No, it is not a perfect cube. A perfect cube is a number that is obtained when you cube an integer. For example, 8 (cube of 2), 27 (cube of 3) and 64 (cube of 4). Since -3 cannot be obtained by cubing an integer, it is not a perfect cube.

6 0

3 years ago