Answer:
25/49
Step-by-step explanation:
probability of red and red is (3/7)(3/7) = 9/49
Probability of blue and blue is (4/7)(4/7) = 16/49
Probability of same color = prob. of red and red or prob. of blue and blue
= 9/49 + 16/49
= 25/49
Answer: 20 km/h
Step-by-step explanation:
Speed = Distance / Time
Heon Train:
Translate minutes to hours:
90 minutes = 1.5 hours
= 120 / 1.5
= 80 km/h
Ami's Train
Train leaves at 11:25 and arrives at 15:10.
15:10 - 11:25 = 3hours 45 minutes
3 hours 45 minutes in minutes = (60 * 3) + 45 = 225 minutes
225 minutes in hours is = 225/60 = 3.75 hours
Speed of train = 375 / 3.75
= 100 km/h
Difference between average speeds:
= 100 - 80
= 20 km/h
Y=-5x
you can use point slope or slope intercept to find this one. i did it by using slope intercept, y=mx+b
b in this case is 0, and then to find m you use (y-y)/(x-x) or (-5-0)/(1-0) = -5
Answer:
(7x6) +(7 x y) = 42+7y
y(6 + 7) = 13y
(6 x y) + (6 x 7) = 6y+42
y(6 + y) = 6y+y^2
