Double the sum of 13 and a number

What's greater - 4 or - 6?

What are the solutions to the system of equations? y=2x2-5x-7 y=2x+2

The donut shop is 3 times as likely to sell a glazed donut as an apple donut. If the shop sells 231 glazed donuts, how many donuts should be sold?

How many solutions are there to the following system of equations? 2x+5y=-11 10x+25y=-55

The length of a rectangle is 3 times the width. The perimeter of the rectangle is 56 feet. Find the length of the rectangle.

You have $3000 to use for training your employees each hour of training cost $40 per employee plus a one time $200 fee how many hours of training can you purchase and how many hours of training will each of your employees received

How do you divide big numbers? like for example, 2,673 : 486?

a student was 48 inches tall in 5th grade. now, the student measures 60 inches tall on 8th grade. what is the percent increase of the studet's height

Claire for to a show sale. Everything on the shelf is 35% off the marked price. She falls in love with a pair of red heels that are marked $64.99. if the sales tax is 7.5%, what will the total cost be.?

The population of a certain inner-city area is estimated to be declining according to the model P (t) = 452,000e-0.014t, where t is the number of years from the present.