Karl bought a lawn mower for $450, and he charges customers $20 each to mow their lawns. He uses approximately $2 in gas for each lawn that he mows. How many lawns must he mow to break even?

For several months, a restaurant manager collected data on the number of people at a table (p) and the total bill, in dollars (d). She found that there is a positive linear association between p and d that is best modeled by the equation d = 15.

If x and y are positive integers and 3x+2y=13 what could be the value of y

heo started to solve the quadratic equation (x + 2) 2 - 9 = - 5. He added 9 to both sides and the resulting equation was (x + 2) 2 = 4. Next, he took the square root of each side.

Use the equation v = h - 6 to find the value of v when h = 9.

The following are the ages (years) of 5 people in a room: 13, 22, 15, 14, 15 A person enters the room. The mean age of the 6 people is now 16. What is the age of the person who entered the room

Give an example of a matrix which is its own inverse (that is, where A^-1 = A)

Which polynomial identity will prove that 64+27=91

In a certain elementary school, 52% of the students are girls. A sample of 65 students is drawn. Would it be unusual for more than 70% of them to be girls? Clearly explain your reason. (Note that your random variable is the sample proportion).

Colleen says she is thinking of a 4 digit number in which all the digits are the same the value of the digit in the hundreds place 200 describe the relationship between the values of the digits in the number

You have $37 when you get to the mall. You need to save $3 for bus fare to get back home. Which inequality represents the amount of money, m, you can spend? A. 37 - m > 3 B. 3 < m + 37 C. 37 - m ≥ 3 D. m ≤ 37 + 3