You have a stack of books that is 10 inches tall. How many 1/2-inch thick books are in the stack?

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

If i have 20$ and i gave 5$ away how much i got

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?