10 cookies and 3 brownies costs $11.25
1 answer:
c = cost of a cookie
b = cost of a brownie
(idk if u should put the variable in front of the number, but I'm putting it after)
10c + 3b = 11.25
6c + 9b = 15.75
Isolate one of the variables of one of the equations, and substitute it into the other equation.
I will isolate "c" in the first equation
10c + 3b = 11.25 Subtract 3b on both sides
10c = 11.25 - 3b Divide 10 on both sides
c = 1.125 - or c = 1.125 - 0.3b
Now substitute this into the second equation
6c + 9b = 15.75 Since c = 1.125-0.3b, u can plug in (1.125-0.3b) for c
6(1.125 - 0.3b) + 9b = 15.75 Distribute 6 into (1.125 - 0.3b)
6.75 - 1.8b + 9b = 15.75 Combine like terms
6.75 + 7.2b = 15.75 Subtract 6.75 on both sides
7.2b = 9 Divide 7.2 on both sides
b = 1.25 $1.25
You could continue to find "c"
Since you know "b", you can plug it into one of the equations:
10c + 3b = 11.25
10c + 3(1.25) = 11.25
10c + 3.75 = 11.25
10c = 7.5
c = 0.75
PROOF
6(0.75) + 9(1.25) = 15.75
4.5 + 11.25 = 15.75
15.75 = 15.75
10(0.75) + 3(1.25) = 11.25
7.5 + 3.75 = 11.25
11.25 = 11.25
You might be interested in
Answer:
The 95% confidence interval for the difference in the proportion of cancer diagnoses between the two groups is (0.3834, 0.5166).
Step-by-step explanation:
Before building the confidence interval, we need to understand the central limit theorem and subtraction between normal variables.
Central Limit Theorem
The Central Limit Theorem estabilishes 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
Subtraction between normal variables:
When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.
The randomly sampled 400 dogs from homes where an herbicide was used on a regular basis, diagnosing lymphoma in 230 of them.
This means that:
Of 200 dogs randomly sampled from homes where no herbicides were used, only 25 were found to have lymphoma.
This means that:
Distribution of the difference:
Confidence interval:
The confidence interval is:
In which
z is the zscore that has a pvalue of .
95% confidence level
So , z is the value of Z that has a pvalue of
, so
.
The lower bound is
The upper bound is
The 95% confidence interval for the difference in the proportion of cancer diagnoses between the two groups is (0.3834, 0.5166).