Find 9% of 768 i completly forgot how to do this

What is the area of triangle pqr on the grid? a triangle pqr is shown on a grid. the vertex p is on ordered pair 7 and 6, vertex q is on ordered pair 1 and 6, and the vertex r is on ordered pair 4 and 2. 5 square units 6 square units 10 square units 12 square units

How many $20 bills do you need to have to make $280

Find the nonpermissible replacement for binthis expression.b2/5b +5