Evaluate expression: evaluate each expression when a = "-2" b=4 and c=-10 2a+b

ac-b

a+b/a

8a+5b

-4a-b

3c/-5

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?

Hello, i need compare km^2 and km. what's difference in this?

Acompound inequality is graphed, and its graph consists of all real numbers. which open scentence could have resulted in this solution set r> 3 or r< -2. r< 3 or r< -2. r> 3 or r> -2. r< 3 or r> -2 plz asap