Can someone explain integers for me? I dont really get it like why do 2 negatives equal a postitive?

40cm in 18mm as a ratio

Wyoming is an approximately square-shaped state. The area of Wyoming is 97,818 square miles. To the nearest mile, how long is one side of Wyoming?

One pack of pencils currently cost $1.19. The cost of one pack of pencils is porjected to increase by 135% in the next 5 years. What is the projected cost of a pack of pencils 5 years from now?

Drag each expression to show whether it is equivalent to 36x + 9, 9 (4x - 1), or (4 • 9x) + (4 • 2).

Manuel and Joe order pasta for $4.55, salad for $5.15, and 2 glasses of lemonade for $1.70 each. The tax is $1.05. How much change should they get from $15.00?

What does it mean if y and x equal zero?

A roller coaster begins at 90 feet above ground level. Then it descends 105 feet. Find the hight of the coaster after the first decent.

Determine the integer whose product with - 1 is 63

What is the standard deviation of the data set? 21 6 18 21 20 14 19 5.4 29.3 5.0 25.1

You randomly draw a marble from a bag of marbles that contains 3 blue marbles, 4 green marbles, and 5 red marbles. What is P (draw a blue marble)