Would someone be able to me answer the following questions ? a) 3c-9d+7c+5db) 4a+7b+5a-bc) 6c+4d-c-7d

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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.

What is the area of the shaded sector?