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AleksAgata [21]
2 years ago
13

Which of the following is an example of a quadratic equation?

Mathematics
1 answer:
WARRIOR [948]2 years ago
8 0

Answer: B

Step-by-step explanation:

A quadratic equation has degree 2.

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The answer is 51/40=1 and 11/40
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Find inverse of y=1/2x+8
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On Earth, 1kg=9.8N=2.2lbs. On the moon, 1kg=1.6N=0.37lbs
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A.50*9.8
B.50*1.6
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Write an equation to find the number. Solve. Twenty-four less than 4 times a number is equal to 30 more than -2 times the number
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Read 2 more answers
A toy manufacturer wants to know how many new toys children buy each year. A sample of 1492 children was taken to study their pu
julia-pushkina [17]

By assuming the standard deviation of population 2.2 the confidence interval is 8.67 toys,8.94 toys.

Given sample size of 1492 children,99% confidence interval , sample mean of 8.8, population standard deviation=2.2.

This type of problems can be solved through z test and in z test we have to first find the z score and then p value from normal distribution table.

First we have to find the value of α which can be calculated as  under:

α=(1-0.99)/2=0.005

p=1-0.005=0.995

corresponding z value will be 2.575 for p=0.995 .

Margin of error=z*x/d

where x is mean and d is standard deviation.

M=2.575*2.2/\sqrt{1492}

=0.14

So the lower value will be x-M

=8.8-0.14

=8.66

=8.67 ( after rounding)

The upper value will be x+M

=8.8+0.14

=8.94

Hence the confidence interval will be 8.67 toys and 8.94 toys.

Learn more about z test at brainly.com/question/14453510

#SPJ4

8 0
2 years ago
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