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Advocard [28]
3 years ago
15

The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 900 hours and a standard deviation

of 55 hours. Out of 720 freshly installed light bulbs in a new large building, how many would be expected to last between 800 hours and 1030 hours, to the nearest whole number?
Mathematics
1 answer:
max2010maxim [7]3 years ago
7 0

Answer: 689

Step-by-step explanation:

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Write a the equation of a line perpendicular to the line y=-7 and goes through the point (-2,3)
kap26 [50]

Answer:

y = 3x + 2

Step-by-step explanation:

Convert the equation to slope intercept form to get y = –1/3x + 2.  The old slope is –1/3 and the new slope is 3.  Perpendicular slopes must be opposite reciprocals of each other:  m1 * m2 = –1

With the new slope, use the slope intercept form and the point to calculate the intercept: y = mx + b or 5 = 3(1) + b, so b = 2

So y = 3x + 2

6 0
3 years ago
HELP URGENT
vekshin1
16 gal = 200 mi
X gal = 350

16/200 = X/350

Cross multiply divide

16(350) = 200(X) > 5600 = 200X

Solve for X

5600/28

X = 28
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2 years ago
Which expression correctly represents “six more than the product of five and a number, decreased by one”?
Nataly_w [17]

Answer:

Step-by-step explanation:

Product of 5 and a number:  5n

Six more than that would be 5n + 6

Finally, "six more than the product of 5 and a number, decreased by one" would be

5n + 6 - 1, or 5n + 5

7 0
3 years ago
Carmen represents the equation y=x^2+1 using a graph. She says her graph shows there is more than one input for almost every out
Korvikt [17]

No - It is a function.


A relation which is not a function has more than 1 output for an input.

7 0
3 years ago
A town has 41% of its registered voters registered as Democrats. If 1,264 votes are cast in a mayoral election in town, about ho
ipn [44]
The answer is D. I believe
8 0
3 years ago
Read 2 more answers
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