Simplify each expression using the order of operations. 13(-3 + n)

pls hurry my sister needs to turn this in soon

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?