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zheka24 [161]
3 years ago
15

A marine biologist is studying the population of bottle-nosed dolphins that lived in the Gulf of Mexico. On an outing one summer

, they captured and tagged 60 dolphins. The next summer, they captured 90 and found that only 12 had been tagged. Based on this data, how many dolphins can they assume are living in the Gulf of Mexico?
Mathematics
1 answer:
mr Goodwill [35]3 years ago
8 0

Answer:

.......

Step-by-step explanation:

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Lisa [10]
I think that the answer is #2. 
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Answer the question on the image <br><br><br><br> ty :P
sattari [20]
Answer : 7 or 7/1

step by step explanation:
6 0
3 years ago
HELP PLZ I GIVE YOU BRAINLIEST IF YOU GET CORRECT PLZ I BEG YOU
DiKsa [7]

Answer:

Original number = 38

Step-by-step explanation:

10*x + y

x   = y - 5

10y + x = 2 (10x + y) +  7

10y + y - 5 = 2(10(y - 5) + y) + 7

11y - 5 = 2(10y - 50 + y ) + 7

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11y - 5 = 22y - 100 + 7

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x = y - 5

x = 8 - 5

x = 3

So the original number is 38. Does that work?

3 is 5 less than 8.

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83 = 76 + 7

83 = 83.         Yes it works.

8 0
3 years ago
Suppose you are to select a password of size 4. The first character should be any lowercase letter or a digit, while the second
Goshia [24]

First question seems incomplete :

Answer:

40 ways

Step-by-step explanation:

Question B:

Number of boys = 6

Number of girls = 4

Number of people in committee = 3

Number of ways of selecting committee with atleast 2 girls :

We either have :

(2 girls 1 boy) or (3girls 0 boy)

(4C2 * 6C1) + (4C3 * 6C0)

nCr = n! ÷ (n-r)!r!

4C2 = 4! ÷ 2!2! = 6

6C1 = 6! ÷ 5!1! = 6

4C3 = 4! ÷ 1!3! = 4

6C0 = 6! ÷ 6!0! = 1

(6 * 6) + (4 * 1)

36 + 4

= 40 ways

3 0
2 years ago
(15) ? Is this correct or am I missing something, thanks :)
svetoff [14.1K]
You are correct!

Step 1:Write what you know
Madeline's Height: 6 ftMadeline's Shadow: 108 in
Friend's Height: X (we use X as a variable because his height is unknown)Friend's Shadow: 108 in - 1.5 ft                              108 in - 18 in                                 90 in
Step 2:Set up proportions
6          x----- = -----108      90 
Step 3:Cross Multiply & Solve
108x = 540x = 5 ft tall

4 0
3 years ago
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