Answer:
a 3x
no explanation k
vdbxncgmchkfukfukgul v can gmvh,vhkvhfyyyyyyyyy
Answer:
x²-9=x²-3²=(x+3)(x-3)
Step-by-step explanation:
use formula
a²-b²=(a+b)(a-b)
Answer:
c
Step-by-step explanation:
c=2*22/7r
440=44/7r
440*7/44=r
70=r
d=2r
d=2*70
d=140 cm
Answer: 1.509
Step-by-step explanation:
The formula of Margin of Error for (n<30):-

Given : Sample size : n= 22
Level of confidence = 0.99
Significance level : 
Using the t-distribution table ,
Critical value : 
Standard deviation: 
Then, we have

Hence, the margin of error for a 99% confidence interval for the population mean =1.509