Answer:
Each eraser costs $2.00
Step-by-step explanation:
<u>Step 1: Make an equation</u>
4 + 5a = 14
4 = shows that cost for one magazine
5a = shows that 5 erasers cost a each
14 = total price
<u>Step 2: Solve for a</u>
Subtract 4 from both sides: 4 + 5a - 4 = 14 - 4
Divide by 5 from both sides: 5a / 5 = 10 / 5
Answer: a = 2
Set up the composite function and evaluate
fg (x^2)=gx^4
Three consecutive even integers can be represented by x, (x+2), and (x+4).
(x + (x + 2) + (x + 4)) - 10 = -22 Get rid of the parentheses
x + x + 2 + x + 4 - 10 = -22 Combine like terms (x + x + x) and (2 + 4 - 10)
3x - 4 = -22 Add 4 to both sides
3x = -18 Divide
x = -6
Check you work.
x = -6
x + 2 = -4
x + 4 = -2
(-6 - 4 - 2) - 10 = 22
-12 - 10 = -22
So, your three integers are -6, -4, and -2 .
Answer:
0.024
Step-by-step explanation:
Central Limit Theorem
The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean and standard deviation , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean and standard deviation .
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean and standard deviation
Suppose the true proportion of high school juniors who skateboard is 0.18.
This means that
Samples of 250 high school juniors are taken
This means that
By how much would their sample proportions typically vary from the true proportion?
This is the standard error, so:
So 0.024 is the answer.
A 6-pound bag of cat food is the better buy, because it costs $2.14 per pound and bag costs $12.84.
I got $2.14 by dividing 6 from $12.84.
However, I don’t know if it’s correct, but I hope you get the answer correct.