7(x+4)=0
7x+28=0
7x=-28
X=-28/7
X=-4
Hi there! You are subtracting a negative number, which is basically the same thing as adding, because two negatives make a positive. B and C is out, because they do not fit the expression. You are actually adding both numbers and anytime you have to subtract a negative number, you add. When you do basic math, 4 + 7 is 11. Both numbers are negative and D does not work, because you're adding from a negative number. The only answer choice that has the expression is A. The answer is A.
Using the Central Limit Theorem, it is found that the mean of the sampling distribution of sample proportions is 0.37.
The <em>Central Limit Theorem</em> establishes that, for a <u>proportion p in a sample of size n</u>, the sampling distribution of sample proportions has:
- Mean .
- Standard error
For this problem, about 37% of high school seniors have vaped in the past year, hence .
- Then, the mean of the sampling distribution of sample proportions is 0.37.
For more on the Central Limit Theorem, you can check brainly.com/question/4086221