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Olenka [21]
3 years ago
14

X = 3 - y

Mathematics
2 answers:
bagirrra123 [75]3 years ago
6 0

Answer:

A

Step-by-step explanation:

Given the 2 equations

x = 3 - y → (1)

5x - 12 = y → (2)

Substitute x = 3 - y into (2)

5(3 - y) - 12 = y ← distribute and simplify left side

15 - 5y - 12 = y

3 - 5y = y ( add 5y to both sides )

3 = 6y ( divide both sides by 6 )

\frac{3}{6} = y, that is

y = 0.5 → A

beks73 [17]3 years ago
4 0

Answer:

A

Step-by-step explanation:

Plug the first equation into the second equation. 5(3-y)-12=y

15-5y-12=y. Combine like terms. 3-5y=y. Move the -5y to the other side. 3=y+5y which is 3=6y divide and y=1/2 or 0.5

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We draw a random sample of size 25 from a normal population with variance 2.4. If the sample mean is 12.5, what is a 99% confide
Helen [10]

Answer:

<h2>11.2≤\mu12.8 </h2>

Step-by-step explanation:

Confidence interval for the population mean is expressed by the formula;

CI = xbar ± Z(S/√n) where;

xbar is the sample mean = 12.5

Z is the z score at 99% confidence = 2.576

S is the standard deviation = √variance

S = √2.4 = 1.5492

n is the sample size = 25

Substituting the given values into the formula given above,

CI = 12.5 ± 2.576(1.5492/√25)

CI = 12.5 ± 2.576(0.30984)

CI = 12.5 ± 0.7981

CI = (12.5-0.7981, 12.5+0.7981)

CI = (11.2019, 12.7981)

Hence the 99% confidence interval for the population mean is 11.2≤\mu12.8 (to 1 decimal place)

7 0
3 years ago
Answer number 2 for me plz and thank you
anyanavicka [17]
The answer to the question is 2:3
3 0
3 years ago
Read 2 more answers
Curtis wants to save money for a trip overseas. Curtis invests $900 in an account that pays an interest rate of 8.75%. How many
professor190 [17]
Hi there
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3 years ago
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Y=5(x-2)(x+1) in standard form
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6 0
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Simplify the expression, Please help!!
Serhud [2]
For the first one it would be C.
3 0
3 years ago
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