Which figure must be a square?
a.
a quadrilateral with four right angles
b.
a rhombus with four right angles
c.
a parallelogram with four congruent sides
d.
a quadrilateral with congruent sides

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?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?