If i have an average of 94% and i make an 80 on a test(60%weight) what is my new average

Hello i need some with trigonometric substitutions. [tex]\int\limits^a_b {x} \, dx[/tex]

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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?