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Harrizon [31]
3 years ago
12

A fish tank contains 18 goldfish and 22 guppies. If you randomly select 2 fish, what is the probability that they are both goldf

ish?
a. 1/20
b. 51/260
c. 1/22
d. 1/36
Mathematics
1 answer:
Mama L [17]3 years ago
5 0
The probability is the number of positive events divided by the number of total possible events. The probability searched will be the probability that the first fish selected is a goldfish times the probability that the second fish selected is also a goldfish. The probability that the first fish selected is a goldfish is the number of goldfish in the tank divided by the total number of fish, i.e. 18 / 40. The probality that the second fish selected is a goldfish is 17 / 39 (because there is one goldfish less in the thank). Then, the joint probability is (18/40)*(17/39) = 306/1560 =102/ 520 = 51/260. Then,<span> the answer is the option b. 51/260</span>
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20 points!! I need help
zaharov [31]

Answer:

11.33 * 16.33 meters to the nearest hundredth.

Step-by-step explanation:

Let the width of the pool be x meters, then the length is x+5 meters.

The length of whole area = x + 5 + 2(3)  = x + 11 meters and the width is

x + 2(3) = x + 6 meters.

So we have the equation (x + 6)(x + 11) = 387.

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x =  [-17 +/- sqrt (17^2 - 4*1*-321)] / 2

x = 11.33 meters

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4 0
3 years ago
How do i evaluate the expression S=8;6s^2
bazaltina [42]

Good evening

Answer:

<h2>384</h2>

Step-by-step explanation:

s = 8 ⇒ 6s^2 = 6(8)²

                     = 6×64

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3 0
3 years ago
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The question is in the picture, someone please answer this.
Lemur [1.5K]

Answer:

1) 25x + 15y = 750

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Step-by-step explanation:

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2 years ago
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Igoryamba

Answer:

49.865%

Step-by-step explanation:

Given that:

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Usibg the Z probability calculator :

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Step-by-step explanation:

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