Answer: 7881
Step-by-step explanation:
Given : A certain type of light bulb has an average life of 900 hours, with a standard deviation of 100 hours.
i.e.
Let x be the random variable that represents the length of life of the bulb .
Now , we find the z-score for this :
For x=820
Now, the probability that the length of life of the bulb is more than 820 hours is given by :-
Now, the number of bulbs installed in amusement park =10,000
Then , the number that can be expected to last more than 820 hours :-
Use the quadratic formula where a = -16, b = 175 and c = 500 to find t. See picture for quadratic formula.
Using it's formula, it is found that the surface area of the mug that is painted blue is of 36.13 square inches.
<h3>What is the surface area of a cylinder?</h3>
The surface area of a cylinder of radius r and height h is given by:
Half of this area is inside the cylinder, and half is outside.
In this problem, the inside of the mug is blue, with r = 2 and h = 3.75, hence:
The surface area of the mug that is painted blue is of 36.13 square inches.
More can be learned about the surface area of a cylinder at brainly.com/question/14657844
Answer:
hi
Step-by-step explanation:
y=3x+24
y-3x=24
y-x= 24/3= 8
y-x = 8
2.
6x +6y= -24
6x+y= -24/6= -4
6x+y= -4
x+y= -4/6= -2/3
x+y= -2/3