The values of the number is 43
x+21=64
subtract 21 on each side
x = 43
Answer:
B
Step-by-step explanation:
A. matched-pair t-test is used ot deterrmine whether two samples are different because sometihng has changed and there are two distributions or there is effectively one distribution. In this scenario only mean of two population is being compared and not the effect of any variable
B. two sample t-test is used to determine whether average between two groups is significantly different or not. In this scenario, mean values of two populatinos are being compared.
C. ANOVAD is used to determine whether means of three or more statistically independent groups are significantly different or not. In this scenario, we have only two groups.
D. Chi-squaed test is used to test relationships between two variables. In this scenario, no relationship is being tested.
E. Inference of regression is used to determine how one population of x-values is dependent on another population of y-values based on the each individual sample values. In this scenario, we are not comparing individual values of two population
Answer:
Step-by-step explanation:
Remember 
You are given the fraction 
First, multiply the numerator and the denominator by -2-3i:
This gives you 13 in denominator, now multiply two complex numbers in numerator:
Thus, the initial fraction is
It’s been awhile since I’ve done a problem like this but I believe it’s solved as below:
The area of a circle is equal to πr2. That will tell you the entire area of the circle. Then you would need to divide that by 2 to get the area of the 180° arc.
So, the area of this circle is 153.94 square meters. If you divide that by 2 (since 180° is half of a circle) you would get 76.97 square meters.
