Lily received $55 for her birthday. She used some of the money to buy 4 pencils priced at m dollars each. Write an expression to show how much money Lily would have left.

55 - 4m = x

Step-by-step explanation:

This expression shows how much money Lily has left.

This is because, if Lily received $55 for her birthday, and she used some of her money to buy 4 pencils that cost m each, 5 minus 4 multiplied by the amount of money each one costed equals the amount that she has left.

Therefore, the correct expression is 55 - 4m = x.

Hope this helps! :D

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0