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makkiz [27]
3 years ago
10

Someone please help me it’s the last question just someone please explain and answer thanks

Mathematics
1 answer:
quester [9]3 years ago
8 0

Answer:

Brackish Water will be the answer as it tells us that we have to classify water with a salinity of 2%. So it falls in the Brackish water table

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How many minutes have elapsed between 7:22 pm and 7:36 pm?
Nutka1998 [239]
The hour has stayed the same. 36-22 is 14. That's 14 minutes between.
4 0
3 years ago
a previous analysis of paper boxes showed that the standard deviation of the length is 9mm. What is the 98% confidence interval
il63 [147K]
We cannot calculate the confidence interval without the sample size.  However, for the second question, the sample size needed would be 49.

The formula we use is

n=(\frac{z_{\frac{\alpha}{2}}\times \sigma}{E})^2

To find the z-score:
Convert 98% to a decimal:  0.98
Subtract from 1:  1-0.98 = 0.02
Divide by 2:  0.02/2 = 0.01
Subtract from 1:  1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value is closest to a z-score of 2.33.

Using the z-score, our standard deviation (9) and our margin of error (3), we have:
n=(\frac{2.33(9)}{3})^2=(6.99)^2=48.86\approx 49
6 0
3 years ago
Find the vertex of y=-x^2+6x-12
Debora [2.8K]
You find the x coordinates using x = -b/2a  = -6/2(-1) = 3

Substitute 3 in the equation and find y

y = -(3^2) + 6(3) - 12 = -9 + 18 - 12 = -3

Vertex (3,-3)
8 0
3 years ago
Simplify square root of 484
zhannawk [14.2K]

Answer:

22

Step-by-step explanation:

484 = 2^2 × 11^2

√484 = 2×11 = 22

3 0
3 years ago
What’s the answerrrrr?
steposvetlana [31]

The answer is 95.

First: find the area if the whole rectangle. To do so you would multiply lxw (10x12)

Second: you would find the area of the square. Squares have perfect sides so you would multiply 5x5.

Last: take the sums of both equations. So the it would be 120-25=95.

7 0
3 years ago
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