Answer:
x-4
Step-by-step explanation:
We have to calculate each product and combine like terms in the following
(√x+2)(√x-2)
Now, (√x+2)(√x-2) {We have to apply the formula (a+b)(c+d) = a(c+d)+b(c+d)}
= √x(√x-2) + 2(√x-2)
= √x.√x -2√x +2√x-2.2
= x-2√x+2√x -4 {Since, √x.√x =x , using the formula xᵃ. xᵇ =x⁽ᵃ⁺ᵇ⁾ }
Now, combining the rational and irrational terms separately we get,
=(x-4)+(2√x-2√x)
=x-4 {Since 2√x and -2√x cancel each other}
(Answer)
Answer:
e^2 -7 = x
Step-by-step explanation:
2=ln(x+7)
Raise each side to the base of e
e^2 = e^ln (x+7)
The e^ln cancel
e^2 = x+7
Subtract 7 from each side
e^2 -7 = x +7-7
e^2 -7 = x
Answer:
Since the p value is lower than the significance level we have enough evidence to conclude that the true means are different at 5% of significance
Step-by-step explanation:
Data given
sample mean for group 1
sample mean for group 2
sample size for group 1
sample size for group 2
sample deviation for group 1
sample deviation for group 2
Solution
We want to check if the two means are equal so then the system of hypothesis are:
Null hypothesis: 
Alternative hypothesis: 
And the statistic is given by:
And replacing we got:
The degrees of freedom are given by:
And the p value would be:
Since the p value is lower than the significance level we have enough evidence to conclude that the true means are different at 5% of significance
Answer:
D
Step-by-step explanation:
the square root of 24 is 4.8 so it has to be D
