Speed = distance/ time
Car : 450m/1min
Train: 69km/45 min
Answer:
-7/5
Step-by-step explanation:
Slope,
(-4-3)/(3-(-2))
= -7/5
Answer:
k=1/4
Step-by-step explanation:
x² - 5kx+ k=0 ....(1)
suppose 2 roots: a and 4a
(x-a)(x-4a)=0
x² - 5ax + 4a² = 0 ....(2)
compare (1) and (2): -5a = -5k a=k
4a² = k 4a² = a (substitute)
a(4a-1) = 0
a = 0 or a = 1/4 (if a=0 k=0 and x=0 is not the solution)
a = 1/4 k = 1/4
(a₂ = 1/4 * 4 = 1)
