Why do we call the numbers we use today hindu-arabic numerals

Because it originated(came from) hindu-arabic numerals.

So you could say that our numbers were called hindu arabic numerals at first then numbers

4. great depression

Remember soh-cah-toasoh: cah: toa: now, looking at the picture we can see that we have an angle, the hypotenuse and want to find the value of the adjacent side to the angle. so we use cah to find the adjacent angle. plug in what we have: we need to solve for x now so we get it by itself on one side: plug this into your calculator and you'll find that: