Direct variations look like this (y = 3x_
Not direct variations (or inverse variations) look like this (y= 1/3x.) They are often in fraction form.
So, in your problem the direct variations are:
y= 3x
x = -1
-0.5x = y
y= 2.2x +7
y= 4
The non-direct variations are:
y = 2/7x
Answer:
D
Step-by-step explanation:
3 is not irrational, it can be converted into a fraction (ratio) 3/1 quite easily
Hello,
Let's assume t the time for counting one step
V the girl velocity in t
v the escalator velocity in t
d the length to go upstairs
going up: V*60+v*60=d
walking down: V*90-v*90=d
so
V+v=d/60
V-v=d/90
2V=d*5/180
V=d*5/360
V=d/72
V*72=d The girl must count to 72 steps.(here v=0)
Answer:
Required probability = 7/75.
Step-by-step explanation:
Probability(purple marble) = 7/15 (as there are 7 marbles out of a total of 15.)
Probability( red marble) = 3/15 = 1/5.
So the probability of a purple being drawn followed by a red marble
= 7/15 * 1/5
= 7 /75 (answer).
Note: the 2 probabilities are multiplied because the 2 draws are independent of each other.
