In the diagram shown at left, three lines intersect to form a triangle. What is the value of x ?

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.