Answer:
Simplified: (3x-6) (-2x-2)
Step-by-step explanation:
What’s the question?
If it’s area then the formula is pi r^2
If it’s the circumference then the 2pi r or pi d
Answer:
3/8, 1/2, 3/4, 7/8
Step-by-step explanation:
If you turn them into decimals it makes it clearer if not
Answer: option A
Step-by-step explanation: We can construct a (1 - α) % confidence interval for mean by using the formulae below.
u = x + critical value × (standard deviation /√n)
Where x = sample mean and n is the sample size.
The critical value that we are going to use (either z or t critical values) depends on the sample size.
If n > 29 we make use of a z test and if n < 29 we make use of a t test.
Also when using a z test we will (sometimes) make use of the population standard deviation.
And when using a t test, we make use of the sample standard deviation.
"Based on last year's book sales, we estimate that the standard deviation of the amount spent will be close to $30"
Judging by the sentence above, we can see that last year books sales is a fraction of several years of book sales, hence the value of standard deviation given is a sample standard deviation.
Since we are making use of a sample standard deviation, we will be using a t test for our critical value and hence sample size must be less than 29.
These points validates option A
To put it simply, what needs to be done in order to answer the question is to substitute the known values from the given to the equation that is also already in the given above,
E = (0.002641)(-$25000) + (0.997359)(193.08)
Simplifying the equation,
E = 126.545
Answer: $126.545
