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3 years ago

Please help me i really need it

Mathematics

1 answer:

Alex17521 [72]3 years ago

3 0

Answer:

Step-by-step explanation:

If you find how many units there are for each point you will be able to figure out the reflection

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A sport analyst wants to determine the mean salary of a Baseball player for 2015. He believes an estimate of this average salary

djyliett [7]

Answer:

The large sample size 'n' = 199.6569≅ 200

Step-by-step explanation:

Step(i):-

Given Standard deviation of salary for all baseball players for 2015 is about $5,478,384.55

Standard deviation of of salary for all baseball players for 2015

(S.D ) σ = $5,478,384.55

Given estimate of this average salary for all baseball players for 2015

= $497,000

Given Margin of error of error is = $497,000

Level of significance ∝ = 80%

The critical value Z₀.₂₀ = 1.282

Step(ii):-

Margin of error of error is determined by

$M.E = \frac{Z_{0.20} S.D}{\sqrt{n} }$

$497,000 = \frac{1.282 X 5,478,384.55}{\sqrt{n} }$

Cross multiplication , we get

$\sqrt{n} = \frac{1.282 X 5,478,384.55}{497,000 }$

On calculation , we get

√n = 14.13

Squaring on both sides, we get

n = 199.6569

Conclusion:-

The large sample size 'n' = 199.6569≅ 200

7 0

4 years ago

The expression 3(2x + 7) − 4(−3x + 5) is equal (=) to

Westkost [7]

Answer:

-6x+26

Step-by-step explanation:

6x+21-12x+5

-6x+26

8 0

3 years ago

Read 2 more answers

Find S10 for -1 + -7 + -13 + -19

Alex777 [14]

First we find the common difference...to do this we subtract the first term from the second term. -7 - (-1) = -7 + 1 = -6

now we are going to find the 10th term
an = a1 + (n-1)*d <== formula for finding any term in arithmetic series
a1 = 1st term, d = common difference, n = term we want to find
now we sub
a10 = -1 + (10 -1) * -6
a10 = -1 + (9 * -6)
a10 = -1 - 54
a10 = - 55

now we will find the sum
Sn = (n (a1+ an)) / 2 <== formula for finding the sum
S10 = (10(-1 - 55))/2
S10 = (10(-56) / 2
S10 = -560/2
S10 = - 280

so the sum of the first 10 numbers is -280

4 0

3 years ago

Please help, having a bit of trouble with it.

Dimas [21]

Answer:

.9b+2

Step-by-step explanation:

You first add 3.8b and -2.9b which equals .9b

Then you add -7 and 9 which equals 2

Hope this helped!

4 0

3 years ago

What is the exact area of a circle having diameter 4in

BartSMP [9]

The diameter of a circle is calculated by using the formula D=r2pi so plug in the known values to find r=2/pi. Next plug r into the area of a circle formula(A=r^2pi) do so and get 4/pi

4 0

3 years ago