Answer:
[1] x - y = -10
[2] 2x + 4y = 22
Step-by-step explanation:
// Solve equation [1] for the variable x
[1] x = y - 10
// Plug this in for variable x in equation [2]
[2] 2•(y -10) + 4y = 22
[2] 6y = 42
// Solve equation [2] for the variable y
[2] 6y = 42
[2] y = 7
// By now we know this much :
x = y-10
y = 7
// Use the y value to solve for x
x = (7)-10 = -3
I am sorry if I got it wrong but I hope this helped.
MARK ME BRAINLEST.
Answer:
It'd be 4/15
Step-by-step explanation:
The total marbles is 6, so for black it's 4/6, but it's not being put back in so for the next one, the denominator would be 5. For green it's 2/5
4/6 times 2/5 equal 4/15
Hope this helps!
Answer:
A sample size of 385 is needed.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
That is z with a pvalue of 
, so Z = 1.96.
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
You feel that a reasonable estimate of the standard deviation is 10.0 hours.
This means that 
What sample size is needed so that the expected margin of error of your estimate is not larger than one hour for 95% confidence?
A sample size of n is needed. n is found when M = 1. So
Rounding up:
A sample size of 385 is needed.
I used to look at the examples i can’t remember now what it is but look at the examples
Answer:
I could only find a single semi-complete question on that paper due to the quality of the picture. <u>The carbon dioxide and water escape from the tube, because as gases, they do not have a definite shape or volume, and instead expand to fit whatever container they are in.</u>
Hope it helps
