Which of the following is a discrete random variable?

the average annual increase in fuel price

a car's speed at different times

a person's weight

the number of cars passing a tollbooth in a given hour

The number of cars passing a tollbooth in a given hour.

Step-by-step explanation:

Discrete variable is a variable that possess a countable number of values, means the value is obtained by counting.

1. the average annual increase in fuel price  - This is not discrete as the values can be decimal. And it is obtained by measuring, so it is continuous variable.

2. a car's speed at different times  - This is also not discrete. This is also continuous variable.

3. a person's weight - This is also not discrete.

4. the number of cars passing a tollbooth in a given hour  - This is discrete as we can count the number of cars.

23

step-by-step explanation:

x = 2

step-by-step explanation:

if sr parallel to ba then the sides bc and ac are in proportion, that is

= ← substitute values

= ( cross- multiply )

27x = 6(4x + 1)

27x = 24x + 6 ( subtract 24x from both sides )

3x = 6 ( divide both sides by 3 )

x = 2