Answer: 27
Step-by-step explanation: To evaluate this expression, we will need to plug in the value of "z" to get our answer. In this problem, we are given that "z" is equal to 3 so we will multiply 9 by 3 which equals 27.
Answer:
x = ±6
Step-by-step explanation:
Step 1: Write out equation
x² + 7 = 43
Step 2: Subtract 7 on both sides
x² = 36
Step 3: Square root both sides
√x² = √36
x = ±6
Answer:
The standard error of the mean = 5.14 mins
Step-by-step explanation:
Number of random sample (n) = 20
Mean(X) = 31.25 mins
Standard deviation (α) = 23.7 mins
Standard error of mean =
standard deviation / √sample size
= 23.7/√20
= 23.7/4.4721
= 5.14 mins
10x - 12 + 10 = 18 - 20
10x - 2 = -2
10x = 0
x = 0
4=2c-12-4
4=2c-16
20=2c
10=c
