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klasskru [66]
2 years ago
11

Help me pleasee pleaseee

Mathematics
2 answers:
erma4kov [3.2K]2 years ago
6 0

Answer:

I will help you but what is the question.

Step-by-step explanation:

Minchanka [31]2 years ago
5 0

Answer:

WHAT IS YOUR QUESTION

Step-by-step explanation:

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Ian is a phycologist interested in determining the proportion of algae samples from a local rivulet that belonged to a particula
pickupchik [31]

Answer: 16590

Step-by-step explanation:

The formula we use to find the sample size is given by :-

, where p = prior estimate of population proportion.

z^*= Critical z-value (Two- tailed)

E= Margin of error .

Let p be the population proportion of cyanobacteria.

Given : E = 0.01

Critical value for 99% confidence interval : z^*=2.576

If Ian does not want to rely on previous knowledge , then we assume p=0.5 because the largest standard error is at p=0.5.

Now, the required sample size = n=0.5(1-0.5)(\frac{2.576}{0.01})^2

n=0.25(257.6)^2=0.25(66357.76)=16589.44\approx16590

Required sample size = 16590

5 0
3 years ago
Chloe made 8 out of 20 baskets in her basketball game. What is her<br> experimental probability? ???
Lerok [7]

10 would be 50% so 1 is 5% 5x8 =40

Her experimental probability is 40%

8 0
3 years ago
Brianna went into a bakery and bought 2 cookies and 3 brownies, costing a total of $9.50. Nevaeh went into the same bakery and b
Ivenika [448]

Answer:

Step-by-step explanation:

c=cookies

b=brownies

2c+3b=9.50 > Briana

10c+6b=20.50 > Nevaeh

7 0
3 years ago
Rewrite the function by completing the square 4x^2-16x +7
tia_tia [17]

Answer:

(2x-4)^2-9 => 4(x-2)^2-9

Step-by-step explanation:

=> 4x^2-16x+7\\ =>(2x)^2-2*(2x)*(4)+7\\ =>(2x)^2-2*(2x)*(4)+(4)^2-(4)^2+7\\ =>(2x-4)^2-9\\ =>4(x-2)^2-9

6 0
3 years ago
Colin drove 45 minutes to the air port. He arrived 90 minutes before his flight departed and then he spent 70 minutes in the air
Gnom [1K]

Given: The time taken to do each activity from Colin's house to his hotel in given.

  • he drove to the airport for 45 minutes
  • he waited at the airport for the flight to depart for 90 minutes
  • his fight duration was 70 minutes
  • upon landing, he gathered his luggage for 20 minutes
  • he drove to the hotel for 35 minutes

To Find: what is true of any expression that represents the total time Collin spent traveling from his house to the hotel

Solution: Any expression will involve the sum of all the durations of his various activities i.e., 260 minutes or 4 hours and 20 minutes.

Explanation:

As each of the activities described is an independent activity that does not overlap, we can easily sum up the durations of each to find the total time Collin took from his house to the hotel.

We add it as follows :

he drove to the airport for 45 minutes + he waited at the airport for the flight to depart for 90 minutes + his fight duration was 70 minutes + upon landing, he gathered his luggage for 20 minutes + he drove to the hotel for 35 minutes.

So, 45+90+70+20+35 = 260 minutes

which means it took a total of 260 minutes or 4 hours and 20 minutes from Collin's house to his hotel.

7 0
3 years ago
Read 2 more answers
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