How much money do you need to invest at 2.75% compounded annually in order to have $12,000 after 7 years?

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?