A woman owns 21 pets. Each of her pets is either a cat or a bird. If the pets have a total of 76 legs, how many cats and how many birds does the woman own?

The figure shows an aerial view of a playground. If David runs around the field three times, he covers a distance of yards.

Zippy's car rentals charge $25 per day plus a $20 service charge to rent one of its mid-size cars. Smyth's Car Rentals charges $20 per day plus a $40 service charge to rent one of its mid-size cars.

Simplify the following expression: (-12) + 29

Graph each pair of parametric equations. x = 3 sin3t y = 3 cos3t

Simplify (5a) (5b). 10ab 25ab 55ab

Seth has just decided to replace his computer. His old computer cost him $1,433 when he bought it exactly seven years ago. Seth paid for it with his credit card, which has an APR of 11.70%, compounded monthly.

The line of symmetry of the parabola whose equation is y = ax^2 - 4x + 3 is x = - 2. What is the value of "a"?

The weights of extra-large eggs have a normal distribution with a mean of 1 ounces and a standard deviation of 0.1 ounces. what is the sampling distribution of the sample mean weight of the eggs in a randomly selected carton of a dozen eggs? n (1, 0.

Working together, Rocco and Giulia can paint a room in 3 hours. It would have taken Rocco 7 hours to do the job alone. Which equation can be used to determine r, Giulia's rate of work in parts per hour? + 3r = 7 + 3r = 1 = r = 3r

Which r-value represents the weakest correlation? -0.75 -0.27 0.11 0.54