87 numbers do not contain the digit 9
Answer:
31
Step-by-step explanation:
5+(6-5)+5^2
use PEMDAS,
Parentheses
Exponents
Multiply
Divide
Addition
Subtraction
meaning-
5+(6-5)+5^2
5 + 1 + 5^2
5 + 1 + 25
31
Answer:20 students chose option 1
Step-by-step explanation:
20 students chose option 1
answer
Answer:
2,436 students
Step-by-step explanation:
At a 90% confidence level, the z-score is 1.645 and the confidence interval is given by:

Where s is the standard deviation, and n is the sample size.
If they want the length of their confidence interval to be no greater than 0.2, it must be no further than 0.1 from the mean 'X':

Rounding up to the next whole number, the sample size should be 2,436 students.
Answer:
5x-15=x+13
Step-by-step explanation:
I don't know which equation you want me to simplify, so I assume it is, 5(x – 3) = x + 13?