Answer:
15
Step-by-step explanation:
The first thing is to calculate what she used for the card that would be:
20 - 17.9 = 2.1
Which means that she spent a total of $ 2.1.
They tell us that the value of the minute at long distance is 0.14 dollars, to know the time in minutes that it took, speaking, we must divide the value spent by the value of each minute, like this:
2.1 / 0.14 = 15
Which means it took 15 minutes for the only call he made.
Let A be attendance, t the temperature and n the number of days. Then,
A


A=k

Where k is a constant of proportionality;
If A=3200, T=88 and n=8, then k,
3200=

3200=11k
k=

Rewriting the equation and replacing the value of k,
A=

When t=92 and n=12
The A=

A=

A= 2231
9514 1404 393
Answer:
3
Step-by-step explanation:
The common difference of an arithmetic sequence is the slope of the equation that describes it. The slope formula is useful in this case:
m = (y2 -y1)/(x2 -x1)
m = (219 -213)/(4 -2) = 6/2 = 3
The common difference of the corresponding arithmetic sequence is 3.
Answer:


The equations have the same slope but different y-intercepts. This means the lines are parallel and there is no solution (since they do not intersect).