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3 years ago

The expression 7! is equal to which of the following? A) 720 B)4050 C)40320 D)7

Mathematics

2 answers:

Ugo [173]3 years ago

7 0

7! = 7*6*5*4*3*2*1 = 5040

None of the above

vfiekz [6]3 years ago

7 0

The answer weould be B ...

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Weight of a rock: In a geology course, students are learning to use a balance scale to accurately weigh rocks. One student plans

statuscvo [17]

Answer:

The student who weighted the rock 5 times has a 95% confidence interval of (25.2, 29.1) which is guaranteed to be more wider (less precise) than the other student who weighted the rock 20 times.

Step-by-step explanation:

What is Confidence Interval?

The confidence interval represents an interval that we can guarantee that the target variable will be within this interval for a given confidence level.

The confidence interval is given by

$CI = \bar{x} + t_{\alpha/2}(\frac{\sigma}{\sqrt{n} } ) \\$

Where $\bar{x}$ is the mean weight $\sigma$ is the standard deviation $t_{\alpha/2}$ is the critical value from t-table and n is the sample size.

The term $t_{\alpha/2}(\frac{\sigma}{\sqrt{n} } )$ is known as margin of error.

As the sample size is decreased the corresponding margin of error increases which results in wider confidence interval which means smaller precision.

The student who weighted the rock 5 times has a 95% confidence interval of (25.2, 29.1) which is guaranteed to be more wider (less precise) than the other student who weighted the rock 20 times.

We can say with 95% confidence that the true mean weight of the rock is within the interval of (25.2, 29.1).

7 0

3 years ago

Look at the Hexagon below

Mama L [17]

Answer:

Angle 9: 60°

Angle 10: 30°

Side = radius = 40sqrt(x/3)

Area = [800sqrt(3)]x

Step-by-step explanation:

Total angle in a hexagon:

(6 - 2) × 180

720

Each interior angle:

720/6 = 120

angle 9 = 120/2 = 60

Angle 10 = 60/2 = 30

sin(60) = 20sqrt(x)/r

r = 20sqrt(x) ÷ sqrt(3)/2

r = 40sqrt(x/3)

Side:

sin(30) = ½s/(40sqrt(x/3))

½s = 20sqrt(x/3)

s = 40sqrt(x/3)

Area = (3sqrt(3))/2 × s²

Area = 3sqrt(3)/2 × 1600x/3

Area = [800sqrt(3)]x

4 0

3 years ago

Please help with the question below!

il63 [147K]

Answer:

B cuz i said so

Step-by-step explanation:

4 0

3 years ago

Perform the indicated operation. x/x + 1 - 1/x - 1 + 2x/x^2 - 1 =

luda_lava [24]

$\frac{x}{x + 1} - \frac{1}{x - 1} + \frac{2x}{x^{2} - 1}$
$\frac{x}{x + 1} - \frac{1}{x - 1} + \frac{2x}{(x + 1)(x - 1)}$
$\frac{x(x - 1)}{(x + 1)(x - 1)} - \frac{1(x + 1)}{(x + 1)(x - 1)} + \frac{2x}{(x + 1)(x - 1)}$
$\frac{x^{2} - x}{(x + 1)(x - 1)} - \frac{x + 1}{(x + 1)(x - 1)} + \frac{2x}{(x + 1)(x - 1)}$
$\frac{x^{2} - x + x + 1 + 2x}{(x + 1)(x - 1)}$
$\frac{x^{2} + 2x + 1}{(x + 1)(x - 1)}$
$\frac{(x + 1)(x + 1)}{(x + 1)(x - 1)}$
$\frac{(x + 1)^{2}}{(x + 1)(x - 1)}$
$\frac{x + 1}{x - 1}$

4 0

3 years ago

If Dora travels 612 miles in 9 hours what is her rate of speed in miles per hour?

KIM [24]

Answer:

68 miles per hour

Step-by-step explanation:

Divide 612 miles by 9 hours

6 0

3 years ago