pasha is thinking of a number such that when twice the number is added to three times one more than the number she gets the same
2 answers:
Answer:
The number is -7.
Step-by-step explanation:
Let the number be = x
when twice the number is added to three times one more than the number. Mathematically, we can denote this as:
She gets the same result as when she multiplies four times one less than the number.
Now, both the results are same, so we will equate them same.
=>
=>
=>
This gives x = -7
So, the number Pasha was thinking was -7.
We can check this:
=>
=>
=> (checked)
You might be interested in
<h2>Answer:</h2>
Variance
<h2>Step-by-step explanation:</h2>The standard deviation is related to the variance. The standard deviation measures the variation or dispersion of a set of data and is represented by the Greek letter sigma , while the variance measures how far a set of numbers are spread out from their average value. The variance is obtained by squaring the standard deviation, so the variance can be found as
Yes here’s some other versions of pi you can use
Answer:
There is a 34.60% probability that 0 or 1 of them is nearsighted.
Step-by-step explanation:
For each children, there are only two possible outcomes. Either they are nearsighted, or they are not. This means that we can solve this problem using the binomial probability distribution.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
In which is the number of different combinatios of x objects from a set of n elements, given by the following formula.
And p is the probability of X happening.
In this problem, we have that:
12% of children are nearsighted. This means that .
A school district tests all incoming kindergarteners' vision. In a class of 18 kindergarten students, what is the probability that 0 or 1 of them is nearsighted?
There are 18 students, so
This probability is:
So
So
There is a 34.60% probability that 0 or 1 of them is nearsighted.