The answer is 7/10 the common demontior is 10 so the numbers change to 2/10 + 5/10 witch equals 7/10
Answer:

Step-by-step explanation:
To determine the slope of a line given the coordinates of two points on the line, use the slope formula.

x1 and y1 are the coordinates of the first point. The second point's coordinates are x2, y2.



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Answer:
0
Step-by-step explanation:
pretty easy tbh
Answer:
This is an RTD question. Here is a table based on the given information:
up/down . . . .rate . . . .time . . . .distance
upstream . . . . r-4 . . . . T . . . . 7
downstream . . . . r+4 . . . . T . . . .15
Now, rate x time = distance, so
time = distance / rate.
solve each for T and we get
T = (7/(r-4))
T = (15/(r+4))
set the times equal and we get
7%2F%28r-4%29+=+15%2F%28r%2B4%29
cross multiply to get
7r+%2B+28+=+15r+-+60
subtract 7r to get
28+=+8r+-+60
add 60 to both sides to get
88+=+8r
divide by 8 to get
r+=+8tep
Answer:
Look at my in the photo
Step-by-step explanation: