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beks73 [17]
3 years ago
6

2

Mathematics
1 answer:
Elan Coil [88]3 years ago
5 0

Answer: Initial height before launch

Step-by-step explanation:

Given

The equation y=-9.8t+109.7t+7.4  the height of toy rocket after t sec

when the rocket is launched, time is t=0

Substituting 0 for t in the equation

\Rightarrow y(0)=-9.8(0)+109.7(0)+7.4\\\Rightarrow y(0)=7.4

Here, 7.4 represents that rocket is already at a height of 7.4 m before the launch.

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The life of a manufacturer's compact fluorescent light bulbs is normal, with mean 12,000 hours and standard deviation 2,000 hour
vitfil [10]

Z value is a numerical  measurement that describe a value relationship to the mean of a group of values. The standard deviations is 1.25 above the mean is 14,500 hours.

<h3>Given information-</h3>

The mean for the bulb is 12,000 hours.

The standard deviation for the bulb is 2000 hours.

Sample value is 14500.

To find out the how many standard deviation is 14500 mean away from the mean the z value of the mean should be calculated.

<h3>Z value</h3>

Z value is a numerical  measurement that describe a value relationship to the mean of a group of values. Z value is the ratio of the difference of the sample value x and mean \mu to the standard deviation. Thus the z value for the given mean \sigma is,

z=\dfrac{x-\mu}{\sigma}

z=\dfrac{14500-1200}{2000}

z=1.25

Thus the standard deviations is 1.25 above the mean is 14,500 hours.

Learn more about the z value here;

brainly.com/question/62233

4 0
2 years ago
Find the diameter of a circle with an area of 12.6 square inches ​
Mama L [17]

Answer:

Step-by-step explanation

the answer is 10

4 0
3 years ago
HELP ME ASAP PLS Find the surface area of each pyramid. Round to the nearest tenth if necessary.
Deffense [45]

Answer:

357.46 meters squared

Step-by-step explanation:

16 x 12.2 x 1/2 = 97.6

12.2 x 10.6 = 64.66

97.6 x 3 = 292.8

292.8 + 64.66 = 357.46

7 0
2 years ago
Find two numbers that multiply to 16 and also add to -8
mash [69]

Answer:

-4,-4

Step-by-step explanation:

let the numbers be x and y.

x+y=-8

y=-x-8

xy=16

x(-x-8)=16

-x²-8x=16

x²+8x+16=0

x²+4x+4x+16=0

x(x+4)+4(x+4)=0

(x+4)(x+4)=0

x=-4,-4

5 0
3 years ago
Square root of 12/4 irrational or rational number
Mademuasel [1]
\sqrt{12/4} can be simplified to \sqrt{3}, which is an irrational number around 1.732

I hope this helps!
7 0
3 years ago
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