Answer:
If she downloaded 40 songs she would pay $36 per month.
If she downloaded s songs she would pay 0.75(s)+6 per month.
Step-by-step explanation:
there should be a cross multiplication
3(8x)=2
expanding bracket
24x=2
multiple both sides by 24
x=1/12
Alina has $22.4 if her mother gave her 1/6 more of what she had at first.
<h3>
What is a fraction?</h3>
- A fraction is a portion of a whole or, more broadly, any number of equal parts.
- In everyday English, a fraction describes the number of parts of a specific size, such as one-half, eight-fifths, or three-quarters.
To find how much money would Alina has if her mother gave her 1/6 more of what she had at first:
Alina has 3/5 much money as Edna.
Edna has $32.
Alina's mother gave her more 1/6 or 3/5.
So, first, we will find 1/6 of 3/5.
Now, add 3/30 to 3/5.
Hence, Alina has 21/30 as much money as Edna.
Then,
Therefore, Alina has $22.4 if her mother gave her 1/6 more of what she had at first.
Know more about fractions here:
brainly.com/question/17220365
#SPJ4
Answer:
the answer is 12
Step-by-step explanation:
Answer:
Z = (60 - x + y + z) / √a + b + c
Step-by-step explanation:
Since it is a normal distribution, we must calculate the mean and standard deviation, since we do not have data, what we will do is leave them based on these:
Thus Total Mean time = M1 + M2 + M3
given:
M1 = x
M2 = y
M3 = z
Total Mean Time M = x + y + z
Now to calculate the standard deviation we first calculate the variance.
The total Variance V = V1 + V2 + V3
Given:
V1 = a
V2 = b
V3 = c
V = a + b + c
Thus Standard deviation SD of the complete operation is
SD = √ V
SD = √a + b + c
we need to find the probability that the mean time is less than or equal to 60 minutes, the first thing is to find the value of Z.
Formula of Z is:
Z = (X - M) / SD
In this case X = 60.
On plugging the values we get
Z = (60 - x + y + z) / √a + b + c
refer to the Z table and find the Probability of Z ≤ (60 - x + y + z) / √a + b + c