Answer:
x=1/4 , y=-1/4. You can confirm this by substituting the numbers in.
Step-by-step explanation:
Answer:
40:80
Step-by-step explanation:
x+2x=3x
3x=120
120/3=
40
40*2=80
40:80=1:2
Answer:
You should start with a simple equation. And remember- practice makes perfect.
The basic algebraic equation involves simple addition or subtraction with one unknown quantity, such as 2 + x = 7.
1. Subtract 2 from both sides: 2 - 2 + x = 7 - 2.
2. Simplify the equation by doing the math: 2-2+x=7-2=0+x=5, or x = 5.
3. Check your work by substituting the answer, 5, into the equation for x.
The correct answer is x=5.
Answer:
4x
Step-by-step explanation:
Simplify. Combine like terms. Note that x = 1x, being that there is one variable of x.
11x - 6x = 5x
5x - x = 4x
4x is your answer.
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Answer:
Step-by-step explanation:
If we assume that the number of arrivals is normally distributed and we don't know the population standard deviation, we can calculated a 95% confidence interval to estimate the mean value as:
where x' is the population mean value, x is the sample mean value, s is the sample standard deviation, n is the size of the sample, 
is equal to 0.05 (it is calculated as: 1 - 0.95) and 
is the t value with n-1 degrees of freedom that let a probability of 
on the right tail.
So, replacing the mean of the sample by 49, the standard deviation of the sample by 17.38, n by 10 and by 2.2621 we get:
Finally, the interval values that she get is:
