Top 2nd one isn’t a function
Answer:
Step-by-step explanation:
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try!
Complete Question
The complete question is shown on the first uploaded image
Answer:
The confidence level interval is 
Step-by-step explanation:
The sample size is 
The number planning to increase workforce is 
The confidence level is
%
The value of proportion for a plus 4 method is

substituting values


The z-critical value at confidence level of 98% is

This values is obtained from the standard normal table
The confidence level interval can be mathematically represented as

substituting values


=> 
Billy want to re-do his bathroom tiles. He finds out the length and width. Then he uses estimation to figure out how many tiles he needs to buy.
Answer:
She will pay $28.4 for the additional gallons.
Step-by-step explanation:
First find the unit amount:
10.65/3 = 3.55
now multiply:
3.55 x 8 = 28.4