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weqwewe [10]
2 years ago
8

Can someone help me pleas

Mathematics
2 answers:
ziro4ka [17]2 years ago
8 0

Answer:

12x-84y+24z

Step-by-step explanation:

ddd [48]2 years ago
5 0

Answer:

12x - 84y + 24z

Step-by-step explanation:

When doing these if there is a number outside of the parenthesis then that mean you have to combine those terms by that i mean

12(x -7y + 2z)

12× X is combined to be 12x

12 × -7y = -84y

12 × 2z = 24z

so your new expression would be

12x - 84y + 24z

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Suppose the test scores on an exam show a normal distribution with a mean of 82 and a standard deviation of
Zanzabum

Answer:

a) Between 74 and 90

b) 81.86% of the scores are between 78 and 90

Step-by-step explanation:

a) According to the Empirical Rule, in a normal distribution, 95% of the data are within 2 standard deviations of the mean. Therefore, the range that 95% of the scores fall in is between 82-4(2)=74 and 82+4(2)=90.

b) The percent of scores that are between 78 and 90 is: normalcdf(lower,upper,μ,σ) = normalcdf(78,90,82,4) = 0.8185946784 ≈ 0.8186, or about 81.86% of the scores.

5 0
2 years ago
What does X equal? WILL GIVE BRAINLIEST!
stellarik [79]

Answer:it is 18

Step-by-step explanation:

You do 40=2x+4 then do 40-4 and get 36 then 36/2 is 18

3 0
3 years ago
A student bought a book for $7.50 and a pen.the total cost was $9.50.which of the following can be used to find the cost of the
zloy xaker [14]
D: because if you take 9.50-7.50=2 you would get p=price or the price of the pen.
Hope I helped=)
6 0
3 years ago
Read 2 more answers
13. Distributive Property<br> 3(x - 1) = 3x - ?
goblinko [34]

Answer:

\huge\boxed{3x-3}

Step-by-step explanation:

3(x-1)=\\\\\text{Distribute: }\left \{ {{3*x=3x} \atop {3*-1=-3}} \right.\\\\3(x-1)=\boxed{3x-3}

8 0
3 years ago
Read 2 more answers
1) x-1+5<img src="https://tex.z-dn.net/?f=%5Csqrt%7Bx-1%5C%5C%7D" id="TexFormula1" title="\sqrt{x-1\\}" alt="\sqrt{x-1\\}" align
TEA [102]

Answer:

See explanation below

Step-by-step explanation:

Find the value of x in each of the following

1) x-1+5√x-1+3=0

5√x-1 = -x -2

Square both sides

25(x-1) = (-x-2)^2

25(x-1) = x^2+4x + 4

25x-25 = x^2+4x + 4

x^2 +4x + 4 - 25x + 25 = 0

x^2 - 21x + 29 = 0

x = 21±√21²-4(29)/2

x = 21±√441-116/2

x = 21±√325/2

x = 21±18.03/2

x = 21+18.03/2 and 21-18.03/2

x = 19.515 and 1.485

4)  x^4-64=0

x^4 = 64

x = \sqrt[4]{64}

x = 2.83

6 0
2 years ago
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