X=c/r make the r as a subject
1 answer:
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Answer: correct is B
Step-by-step explanation:
Annex the bar graph that shows which improvement time is less, the new formula being more effective, with an average of 55 minutes and the average of the old formula is 75 minutes, which leads to the conclusion that the new formula is better than the previous one with a time difference of 20 minutes.
Consider, pls, this option:
1. if a required line has a form y=ax+b, then points A(-1;6); B(6;k) and C(20;3) belong to it.
2. According to the item 1 it is possible to make up the system of equations for A and C:
Knowing, that a=-1/7 and b=41/7, it is possible to write the equation of required line:
3. Using coordinates of point B:
Answer: 5.
1. if a required line has a form y=ax+b, then points A(-1;6); B(6;k) and C(20;3) belong to it.
2. According to the item 1 it is possible to make up the system of equations for A and C:
Knowing, that a=-1/7 and b=41/7, it is possible to write the equation of required line:
3. Using coordinates of point B:
Answer: 5.