Answer:
x = 7.3
Step-by-step explanation:
-2x + x-4 = 18
First, Combine Like Terms
-3x + (-4) = 18
Then, do Inverse Operations
-3x + -4 = 18
+ 4 +4
Cancel out the -4 +4 because it will equal zero and won't matter to the equation
-3x = 22
Do Inverse Operations again. In this case, you will divide.
-3x = 22
-3x/-3 = 22/-3
Cancel out the -3x/-3
22/-3 = x
7.3 = x
Let angle HAC = A, then
cos A = 24/25 = 0.96
A = cos^-1(0.96) = 16.26
Answer:
33.195%
Step-by-step explanation:
AMDM: 221 students
Physics: 241 students
Taking both: 80 students
80/241 = ~33.195%
Answer:
554 executives should be surveyed.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Z-table as such z has a p-value of 
.
That is z with a pvalue of 
, so Z = 1.96.
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
Standard deviation of 3 hours.
This means that 
The 95% level of confidence is to be used. How many executives should be surveyed?
n executives should be surveyed, and n is found with 
. So
Rounding up:
554 executives should be surveyed.
The answer is A,because the way your question is written,there would be 4 molecules of salt (NA) and one molecule of CL (Chlorine)
