Kalvin's mother tells him that the chance of a coin showing heads when he tosses it is 1/2. does this mean that every time he tosses a coin twice, he will get one head and one tail.

No it is not necessary that Kelvin will get one head and one tail every time

Explanation:

Probability in math is equal to favorable outcomes/total outcomes

The coin has two sides a head and a tail. When we flip a coin we have 50-50 possibility of getting a head and a tail. It means with every toss we have 1/2 possibility of getting head as well as tail.

But this does not mean that when we toss a coin twice we will get one head at one toss and one tail at another toss.

There is a possibility of getting both heads as well as both the tails.

the function makes a strait line horizontally with no x intercept but a y intercept at 9.

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.