F=60, s=60/2=30
(60-x)/(30-x)=4
60-x=120-4x
60+3x=120
3x=60
x=20
s=30-x
s=30-20
s=10
So the boy was 10 years old when his father was four times his age.
When any lines are parallel that means they have the same slope so the slope of the red line would also have a slope of -3/7
The correct answer is option A.
Conditional Probability means the probability of an event given that some other event has already occurred. From the given options, only option A presents such a case in which we have to find the probability of an event along with the data that some other event has already occurred.
We have to find the probability of drawing out a club, given that the card we are drawing is not a heart. So, it is given that the shape on the card is a shape other than the heart. Thus the probability we will calculate will be a conditional probability.
So the sum of 17 and a number x means to add them on one side of the equals sign. The other side would be your 20.
17 + x = 20