Deirdre doubled her savings account balance of $100. Then she withdrew $30 to buy some new clothes. Represent this situation with a numerical expression.

What is 4x * (9+9) = 180

In a sample distribution, X=56 corresponds to z=1.00 and X=47 corresponds to z=-.50. Find the mean and standard deviation for the sample.

What is the factored form of 9X^2+12X+4

Solve the inequality 3 (x+2) >0

The aspect ratio is used when calculating the aerodynamic efficiency of the wing of a plane. For a standard wing area, the function can be used to find the aspect ratio depending on the wingspan in feet. If one glider has an aspect ratio of 5.

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.