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ipn [44]
3 years ago
9

Help me please! I’m begging

Mathematics
1 answer:
Goryan [66]3 years ago
7 0

12) the radius is 15 so with the equation (3.14)*r^2, we get (3.14)(15^2)=706.5

13) true, true (if x=4), true

14) y=0.75x+4.50, $8.25

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tatuchka [14]
The first one is A and the second one is B, hope this helps!!
8 0
2 years ago
The t value for a 99% confidence interval estimation based upon a sample of size 10 is
Aliun [14]
Answer:
For a sample size of 10, the t-value is about 3.25 (from tables) at a 99% confidence interval.

Explanation:
When the standard deviation for the population is not known, the confidence interval estimate for the population mean is performed with the Student's t-distribution.
The confidence interval for the mean is calculated as
(\Bar{x}- t\frac{s}{\sqrt{n}} , \, \Bar{x}+ t\frac{s}{\sqrt{n}}
where
 \Bar{x} = sample mean,
s = sample standard deviation,
t = t-value (provided in tables),
n =  sample size.

When reading the t-value, (n-1) is called the df or degrees of freedom.

7 0
3 years ago
Help me work this out please?
Karo-lina-s [1.5K]
The answer is (-7r-6s)/3s
5 0
3 years ago
What happens to 1.7 when you multiply it by 10'
igomit [66]

Move the decimal point to the right one place value.

1.7 x 10 = 17

17 is your answer

hope this helps

7 0
3 years ago
Suppose I flip two identical coins. What is the probability that I get one head and one tail?
Alexeev081 [22]
50/50 chance to be wrong or right
7 0
3 years ago
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