According to the profit equations given, it is found that since the number of days has to be a positive value, hence the viable answer is that they earn the same profit after 3 days, while the nonviable answer is -4.
<h3>What are the profit equations?</h3>
For the first friend, it is:
For the second, it is:
.
The system we solve to find when they earn the same profit is given by:
Which is a quadratic equation with coefficients a = 1, b = 1, c = -12. Hence:
The number of days has to be a positive value, hence the viable answer is that they earn the same profit after 3 days, while the nonviable answer is -4.
More can be learned about a system of equations at brainly.com/question/24342899
Answer:
We need to sample at least 37 weeks of data.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the margin of error M as such
We want 98% confidence that the sample mean is within $500 of the population mean, and the population standard deviation is known to be $1300
This is at least n weeks, in which n is found when 
So
Rounding up
We need to sample at least 37 weeks of data.
Answer:
Domain: x ≥ -2
Range: y ≥ -4
Step-by-step explanation:
Since the dot is filled in, it means that the values of domain and range will be greater than or equal. The domain is represents all the values of x, and range is of y, shown in the graph. The smallest value of x is -2, and it continues to the right, increasing. The smallest value of y is -4, and it continues its way up, also increasing.
Answer:
4 is a percent of 15 is 0.6
Step-by-step explanation:
if you out 15/0.6 as a fraction you will get 4
