What does simplify the expression mean in math?

What is the solution of the system x - 3y = - 13

During the computer daze special promotion, a customer purchasing a computer and printer is given a choice of six free software packages. there are 8 different software packages from which to select.

In a class of 40 students, 15 offer physics, 20 offer history and 3 offer both physics and history. How many student offer neither physics nor history?

A length of metal pipe has a circumference of 2.5 inches. the pipe is 1/16 inches thick. a gas fitter needs to know the inside diameter of the pipe to calculate the gas pressure.

Molly is wrapping up paarts of sandwiches to sell at her sandwich cart. She cuts each sandwhich in fourths and then wraps each fourth sp=eparatley she says that she wrapped 16 fourths so she wrapped 16 whole sandwiches what was mollys mistake?

The average ice skate size of customers at an ice rink with 200 patrons is 9.5. Assume the data is normally distributed. If the standard deviation of this data is 0.5, how many patrons have a skate size of 10.5 or larger?

Whats a digit the is in the ones place but 5 as a factor?

Which table could be a partial set of values for a linear function? A. x y 0 0 1 1 2 8 3 27 B. x y 0 0.0 1 0.5 2 1.0 3 1.5 C. x y 0 0 1 1 2 4 3 9 D. x y 0 0.0 1 0.5 2 2.0 3 4.5

A rate is a ratio. True or false

K/7=32/56? i have no idea how to solve this