If i have a negative number and a negative number and i have to add it would it be positive or negative ?

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Find the commission on a $590.00 sale if the commission is 15%.

Atransformation t : (x, y) (x-5,y +3) the image of a(2,-1) is