Step-by-step explanation:
f(x)=-x²+8x
By replacing x with -7, we get
f(-7)=-(-7)²+8×(-7)
=-49-56
=-105
Answer:
The sample size is 1875.
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:

Sampling error of 0.03.
This means that 
99.74% confidence level
So
, z is the value of Z that has a pvalue of
, so
.
25% of all adults had used the Internet for such a purpose
This means that 
What is the sample size
The sample size is n. So



Simplifying by 0.03 both sides



The sample size is 1875.
Answer:
what is it
Step-by-step explanation:
type in your questions
Hey !
Here are some tips, follow them to score will in your math exams:
# Firstly after the syllabus is over, ask any of your elder to give some sums and solve them. Take a time limit.
# After writing the exam, you will know your strengths and weaknesses, precise on your week points.
# Every weekend solve at least two practice papers.
# Remember all the theorems and equations.
# Practice everyday
Answer:
hi
Step-by-step explanation: