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Elenna [48]
3 years ago
9

Monica asked her friends to buy a charity raffle ticket for $3. All but 4 of her friends bought a ticket, and she raised $18. Ho

w many friends did Monica ask?
Mathematics
1 answer:
jok3333 [9.3K]3 years ago
6 0

Answer:

10 friends

Step-by-step explanation:

$18/$3 = 6

6 = number of friends that bought a ticket.

4 = number of friends who didn't buy a ticket.

end result, 6+4 = 10

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Data were collected on random specimens of Yellowfin tuna from 1991 and 2010. For the sample of 231 specimens of Yellowfin tuna,
Molodets [167]

Answer:

95% confidence interval: (0.325 ,0.383)

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 231

Sample mean = 0.354 ppm

Sample standard deviation = 0.231 ppm

95% confidence interval:

\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}  

Putting the values, we get,  

t_{critical}\text{ at degree of freedom 4 and}~\alpha_{0.01} = \pm 1.97  

0.354 \pm 1.97(\dfrac{0.231}{\sqrt{231}} ) = 0.354 \pm 0.029 = (0.325 ,0.383)  

6 0
3 years ago
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Step-by-step explanation:

5 0
2 years ago
Find the area, in square feet, of the smallest square. A-169% A-144/12
Aloiza [94]
The answer should be b
7 0
2 years ago
31 - 8a = 5 ( - 4 - 5a )
timama [110]

Answer:

Step-by-step explanation:

31 - 8a = 5(-4 - 5a)

First, on the right-hand side of the equation, let's distribute the 5 to each term in the parenthesis:

31 - 8a = -20 - 25a

Now, let's move all the terms with an a to the left-hand side, and everything else to the right-hand side of the equation:

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a = -3

4 0
3 years ago
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andre [41]

Answer: n = -6

Step-by-step explanation:

3n+14=-4

Subtract 14 from both sides.

3n+14-14=-4-14

Simplify

3n=-18

Divide both sides by 3

3n/3 = -18/3

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5 0
3 years ago
Read 2 more answers
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