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DaniilM [7]
3 years ago
7

The life spans of elephants in a Columbus zoo are normally distributed. The average elephant lives 60 years: the standard deviat

ion is 2 years. Find a range of elephant's life spans which lies within 1 standard deviation, about 68% Between 58 and 62 years Between 56 and 64 years Between 54 and 66 years Between 50 and 60 years
Mathematics
1 answer:
Marta_Voda [28]3 years ago
5 0

did u ever get the answer l need it


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Tickets for a concert are $40 for main-floor seats and $25 for upper level seats. A total of 2000 concert tickets were sold. The
Tems11 [23]

Step-by-step explanation:

<u>to show how many tickets were sold:</u>

x = upper floor tickets

y = main floor tickets

x + y = 2000

<u>to show total amount of revenue:</u>

25x + 40y = 62,000

<u>Finding answer using both equations:</u>

x + y = 2000

multiply each side by 25

25x + 25y = 2000 × 25

25x + 25y = 50,000

25x + 40y = 62,000

-

25x + 25y = 50,000

-----------------------------------

15y = 12,000

^ this is column subtraction

<em>^ this column subtraction is done to isolate y so we can work with one value rather than 2</em>

15y = 12,000

divide each side by 15

12,000 ÷ 15 = 800

y = 800

x + y = 2000

x + 800 = 2000

x = 1200

Therefore 1200 upper-level tickets were sold

800 main floor tickets were sold

4 0
3 years ago
Hopefully you can see the question! If not, jut comment down below this and I'll put the question in the comments :) Thanks for
OlgaM077 [116]

Answer:

2 minutes

Step-by-step explanation:

You can make an equation to model the question.

y=60 initial starting value,

y=(750-720)x, plug in 60 for y,

60=30x, x = 2 minutes

4 0
3 years ago
Explain how u can decide where to place the first digit of the answer for 6,139 / 153
storchak [24]

Answer:

The first digit would go in the tens place.

Step-by-step explanation:

First we estimate the approximate numbers. For 6130 we estimate 6000 and for 153 we estimate almost 150.

So dividing 6000 by 150 would give 40 .

The four would go in the ten's place .

Now check by dividing

         40.1     So the answer is correct. The quotient is 40.12.

153\sqrt{6139}

<u>       612</u>

           190

<u>            153</u>

<u>              37 </u>

The first digit would go in the tens place.

The answer is justified. We can easily decide where to place the first digit.

6 0
4 years ago
At a restaurant mike and his three friends decide to divide the bill evening. If each person paid 13 then what was the total bil
Hatshy [7]
At a restaurant Mike and his three friends that means that there was four people splitting the bill. If each of them paid $13 then the bill was $52

4 * 13 = $52
8 0
3 years ago
An arrangement of marbles has 12 marbles in the first row and 10 rows in all. In each successive row one marble is added.
noname [10]
Firstly, you divide by -2 then |x|  which equals 3 and the solutions x+3
6 0
3 years ago
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