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coldgirl [10]
2 years ago
7

Sam sold half of his coins from his collection and then bought nine more. He now has sixteen.

Mathematics
2 answers:
Maurinko [17]2 years ago
7 0
14 is your answer

Explanation:

If he has 16 now because he bought 9. You would do 16 - 9 which equals 7. And if he sold half of his coins that means he has 14.

14-7=7

(Answer is 14)
Lera25 [3.4K]2 years ago
4 0

Answer:

f

Step-by-step explanation:

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The mayor is interested in finding a 98% confidence interval for the mean number of pounds of trash per person per week that is
saul85 [17]

Solution :

Given :

Sample mean, $\overline X = 34.2$

Sample size, n = 129

Sample standard deviation, s = 8.2

a. Since the population standard deviation is unknown, therefore, we use the t-distribution.

b. Now for 95% confidence level,

   α = 0.05, α/2 = 0.025

  From the t tables, T.INV.2T(α, degree of freedom), we find the t value as

  t =T.INV.2T(0.05, 128) = 2.34

  Taking the positive value of t, we get  

  Confidence interval is ,

  $\overline X \pm t \times \frac{s}{\sqrt n}$

 $34.2 \pm 2.34 \times \frac{8.2}{\sqrt {129}}$

 (32.52, 35.8)

 95% confidence interval is  (32.52, 35.8)

So with $95 \%$ confidence of the population of the mean number of the pounds per person per week is between 32.52 pounds and 35.8 pounds.

c. About $95 \%$ of confidence intervals which contains the true population of mean number of the pounds of the trash that is generated per person per week and about $5 \%$ that doe not contain the true population of mean number of the pounds of trashes generated by per person per week.  

4 0
2 years ago
Find the missing length and round to the nearest tenth if necessary
cricket20 [7]
C= 6.7

A^2 + B^2 = C^2
6^2 + 3^2 = C^2
36+9 = 45
Square root 45 = 6.7
6 0
3 years ago
Read 2 more answers
Subtract: (4n + 7) - (7n - 8)
Furkat [3]
4n+7−(7n−8)

=4n+7+−1(7n−8)

=4n+7+−1(7n)+(−1)(−8)

=4n+7+−7n+8

Combine Like Terms

=4n+7+−7n+8

=(4n+−7n)+(7+8)

=−3n+15

4 0
3 years ago
Find the area of a triangle with vertices (1,5), (1, -2), (3,-2).
igomit [66]
The area is 7 units squared.

3-1 = 2
5--2 = 7
2x7 = 14
14/2 = 7
5 0
3 years ago
Find the total surface area of the cylinder shown. Leave the answer in terms of π. A cylinder with radius 4.25 inches and height
olga_2 [115]

Answer:

87.125\pi in^{2} or 87\frac{1}{8}\pi  in^{2}

Step-by-step explanation:

Given Surface Area of Cylinder = 2\pi rh+2\pi r^{2},

and also given r = 4.25 inches and h = 6 inches.

Let's Substitute r and h into the formula to find the total surface area.

Surface Area of Cylinder = 2\pi (4.25)(6)+2\pi (4.25)^{2} \\=51\pi +36.125\pi \\=87.125\pi in^{2}  or 87\frac{1}{8} \pi in^{2}

5 0
2 years ago
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