Answer:
2988
Step-by-step explanation:
Hello :
<span>a point on the y-axis is : P( 0, y)
</span>PA = PB or PA² = PB².... A(7, -7) B(1,1)
(7-0)²+(-7-y)² = (1-0)² + (1-y)²
49+49+14y+y² = 1+1-2y+y²
16y = - 96
y= - 6
Answer:
D
Step-by-step explanation:
Graph the points. Then count the units vertically and horizontally. See picture.
Answer:
15 days
Step-by-step explanation:
Let x be the number of days needed for B to complete the job. Then x-5 is the number of days needed for A to complete the job.
In 1 day,
- A completes
of all work; - B completes
of all work.
Hence, in 1 day both A and B complete
of all work. A and B working together can do a work in 6 days. Then

Solve this equation:

If
then
that is impossible. So, B needs 15 days to complete the work alone.