What is the area of a cirle of radius r? use r for the radius and pi for π. for on entering a symbolic answer click on the symbolic formatting link below. webassign?

Answer these questions showing your work plz

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

Nick has box brads. he uses 4 brads for the first project. nick let’s b represent the original number of brads and finds that for the second project, the number of brads he uses is 8 more than half the difference of b and 4. write an expression to represent the number of brads he uses for the second project.