Gary’s party ended at 10:00 pm. It lasted 3.5 hours. What time did the party start?

the party began at 6:30

Step-by-step explanation:

if you minus 3 hours from 10 you go to 7pm and 0.5 of a hour is equal to 30 minutes so the party began at 6:30

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)

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation: