Answer:
Second option
Step-by-step explanation:
Answer:
56 music files
Step-by-step explanation:
From the above question:
Let the number of music files
Arely has = x
Valerie has = y
Arely has 4 fewer than twice as many music files as Valerie.
x = 2y - 4
They have a combined number of 86 music files.
x + y = 86
We substitute 2y - 4 for x in the above equation
2y - 4 + y = 86
3y - 4 = 86
3y = 86 + 4
3y = 90
Divide both sides by 3
3y/3 = 90/3
y = 30
Hence, Valerie has 30 music files.
The number of music files that Arely has is calculated as:
x = 2y - 4
x = 2(30) - 4
x = 60 - 4
x = 56
Arely has 56 music files
1. x=1, y=3, z=2
2. x=7/5, y= -3/5, z= 0
3. <span>x = -2.5 + -1.5y + z</span>
Answer: Population , Sample
Step-by-step explanation:
In statistics, Population can be defined as the overall pool from which a statistical sample is drawn. A population may refer to an entire group of people, objects, events, hotel visits, measurements etc. While a sample is defined as a small part of a population used for statistical analysis, which is intended to show what the whole population is like.
In the case above,the population is the 7000 students in the school while the sample is the 1000 students surveyed.
