A commuter must pass through five traffic lights on her way to work, and will have to stop at each one that is red. She estimates the probability model for the number of red lights she hits, as shown below: x = # of Red 0 1 2 3 4 5
P(X = x) 0.05 0.25 0.35 0.15 0.15 0.05

a. How many red lights should she expect to hit each day?
b. What is the standard deviation?

Let w=23 . what is the value of w + 45 ?

Which fraction below is equivalent to 10/12?

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.