Mary drove 4 hours to reach her camping spot. Driving home, she
increased her speed by 15 miles per
hour, reducing her travel time by
1 hour. How fast did she drive going
to the camping spot?

r=45 mph answer

Step-by-step explanation:

d=rt

d=r*4 going

d=(r+15)*3 coming back

4r=3(r+15)

4r=3r+45

4r-3r=45

r=45 mph answer

check: 45*4=180 miles

         60*3=180 miles

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)