For which values of x is the expression undefined?
x
−
9
x
2
+
9
x
+
18
x
2
+9x+18

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?

Liz had 140 pens and inna had 100 pens. after inna gave liz some pens, liz had 3 times as many pens as inna. how many pens did inna give liz?

Agrasshopper weighs 0.89 grams. express the grasshopper’s weight in scientific notation.