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Deffense [45]
2 years ago
12

Please help Find the difference (5ab-7a-9) - (8ab-2)

Mathematics
1 answer:
Rudiy272 years ago
7 0
(5ab-7a-9) - (8ab-2)
5ab - 7a - 9 - 8ab + 2
-3ab -7a -7
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The life of a semiconductor laser at a constant power is normally distributed with a mean of 7,000 hours and a standard deviatio
Scrat [10]

This question not incomplete

Complete Question

The life of a semiconductor laser at a constant power is normally distributed with a mean of 7,000 hours and a standard deviation of 600 hours. If three lasers are used in a product and they are assumed to fail independently, the probability that all three are still operating after 7,000 hours is closest to? Assuming percentile = 95%

Answer:

0.125

Step-by-step explanation:

Assuming for 95%

z score for 95th percentile = 1.645

We find the Probability using z table.

P(z = 1.645) = P( x ≤ 7000)

= P(x<Z) = 0.95

After 7000 hours = P > 7000

= 1 - P(x < 7000)

= 1 - 0.95

= 0.05

If three lasers are used in a product and they are assumed to fail independently, the probability that all three are still operating after 7,000 hours is calculated as:

(P > 7000)³

(0.05)³ = 0.125

7 0
3 years ago
Determine the image of the point (5, -2) under a rotation of 90 degrees about the origin.
Galina-37 [17]

90 degrees means 90 degrees counterclockwise.   So from the fourth quadrant we'll end up in the first quadrant.  X and Y get swapped and one negated, it must be the -2 becoming 2, so our image is

(2,5)

Answer: A


8 0
3 years ago
The figure represents a doorstop in the shape of a triangular prism. What is the volume of the doorstop in cubic inches?​
Makovka662 [10]

Answer:

7 times 5

35

divided by two

17.5

times 3

52.5 cubic inch

7 0
2 years ago
Find the value of x and y (3y+5) (2x+1) 85
Usimov [2.4K]

Answer:

Step-by-step explanation:

I think the answer C x=42 y=30, correct me if i'm wrong

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3 years ago
Round to the nearest tenth if necessary. 60% of 68 is what number?..
galina1969 [7]

Answer:

40.8

Step-by-step explanation:

3 0
2 years ago
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