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2 years ago

12

A safe has a 4-digit lock code that does not include zero as a digit and no digit is repeated. What is The total number of outco

mes is

2 answers:

DENIUS [597]2 years ago

6 0

Answer:4*3*2*1

Step-by-step explanation:

lora16 [44]2 years ago

3 0

9 single digits and since you can’t repeat any, and you need 4 digits in total it’s going to be 9*8*7*6 = 3,024

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Lisa's test grades are 79, 89, and 90. there will be one more test this year. if lisa wants her test average to be at least 88,

erik [133]

For this case, what we are going to do first is to assume that all the exams are worth the same percentage of the final grade.
We have then that Lisa's average grade point equation is:
$88 = \frac{79 + 89 + 90 + x}{4}$
Where,
x: minimum note that lisa must obtain in the last exam.
Clearing x we have:
$x = (88 * 4) - (79 + 89 + 90)

x = 94$
Answer:
the lowest grade she can get on her last test is:
x = 94

5 0

3 years ago

Consider equation of circle x2-2x+y2-4y-4=0,if line 2x-y+a=0 is its diameter then find value of a

g100num [7]

Answer:

Step-by-step explanation:

x² - 2x + y² - 4y - 4 = 0

x² - 2x + y² - 4y = 4

complete the squares

(x² - 2x + x₀) + (y² - 4y + y₀) = 4

the unknown number will be the square of half of the x¹ coefficient

(x² - 2x + 1) + (y² - 4y + 4) = 4 + 1 + 4

(x - 1)² + (y - 2)² = 9

This tells us that the circle is centered on (1, 2)

Which is also a point on the diameter

2x - y + a = 0

a = y - 2x

a = 2 - 2(1)

a = 0

4 0

2 years ago

Optimal-Eats blender has a mean time before failure of 40 months with a standard deviation of 6 months, and the failure times ar

GarryVolchara [31]

Answer:

The warranty period should be of 32 months.

Step-by-step explanation:

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Mean time before failure of 40 months with a standard deviation of 6 months.

This means that $\mu = 40, \sigma = 6$

What should be the warranty period, in months, so that the manufacturer will not have more than 10% of the blenders returned?

The warranty period should be the 10th percentile, which is X when Z has a p-value of 0.1, so X when Z = -1.28.

$Z = \frac{X - \mu}{\sigma}$

$-1.28 = \frac{X - 40}{6}$

$X - 40 = -1.28*6$

$X = 32$

The warranty period should be of 32 months.

7 0

3 years ago

Please solve numbers 16-17

Gelneren [198K]

Answer:

-1 :)

Step-by-step explanation:

4 0

2 years ago

Which of the following sets of transformation provides sufficient information to prove the two circles described are similar?

Reika [66]

<h2>Explanation:</h2><h2></h2>

A circle is simply a curve made up of all the points that are the same distance from the center. This distance is called the radius of the circle. It's important to know that <em>all circles are similar to each other</em>, but what is similarity? It's simply, shapes are similar if we can turn one into the other by moving, rotating, flipping, or scaling. So every circle can match any other circle by moving it, rotating it, flipping it, or scaling it.

Then circles O and Q shown below are similar no matter what's the radii of them.

4 0

3 years ago