1)u multiplies every thing in the bracket giving you 4u×-5u=22
2)multiply 4u and5u=20u
3)divide both sides by 20(u=11)
4)and that's your final answer.
Solve the absolute value equation 3x+2=2
2 answers:
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Answer:
A)
B)
Step-by-step explanation:
On the left, we have five (positive) Xs and one -1. So, we can represent the left with the expression .
On the right, we have six -1s. So, we can represent the right with the expression .
A)
Since the balance is balanced, we know that the two expressions are equal to each other. So, we can write the equation:
B)
Now, we can solve the equation for x. Add 1 to both sides:
The left will cancel. Add on the right:
Finally, divide both sides by 5:
The left side will cancel. So, the value of x is:
Answer:
We need a sample size of at least 657.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is given by:
45 percent of its claims have errors.
So
99% confidence level
So , z is the value of Z that has a pvalue of
, so
.
What sample size is needed if they wish to be within 5 percent of the actual
This is a sample size of at least n, in which n is found when M = 0.05.
We need a sample size of at least 657.