Answer:
the missing number is 6
Step-by-step explanation:
To find the mean, add up all the numbers and divide by the number of numbers
( 2+3+x+5) /4 = 4
Combine like terms
(10+x)/4 =4
Multiply each side by 4
10+x = 16
Subtract 10 from each side
x = 6
Simplify by combining z terms first.
-10z = 18
Now divide both sides of the equation by -10, and simplify.
z = -9/5
The year 2013 contains four digits {2, 0, 1, 3} that are consecutive.
We want to find the next year such that this happens. We will find that in 18 years this will this event occur next.
The next year that this happens is the year that has the same digits, but the tens and units digits are permuted (as these are the place values with smaller values).
So the next year that this happens is:
2031
It also has the digits {2, 0, 3, 1} which has the same digits as 2013.
To find how many years after this will happen, we just need to find the difference between 2031 and 2013.
This is: 2031 - 2013 = 18
In 18 years this will this event occur next.
brainly.com/question/2493629
The $315 cost of the couch after tax, gives the cost before tax, <em>C</em>, as the following equation;
<h3>How can the cost before tax be expressed?</h3>
The cost of the couch with tax = $315
Let, <em>t</em>, represent the tax rate, and let <em>C</em>, represent the cost before tax, we have;
315 = C + C × t
Which gives;
- The cost of the couch before tax, <em>C </em>= 315/(1 + t)
Mathematically, we have the following equation;
Learn more about writing, and analyzing equations here:
brainly.com/question/7187454
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The correct answer is y=1/2x+1
