Iam planning to write my own mathematics book. guide me from where i should insert questions and app to create it

Consider circle c with angle acb measuring 3/4 radians.if minor arc ab measures 9 inches, what is the length of the radius of circle c? if necessary, round your answer to the nearest inch.

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3

Graph the following system of linear inequalities. identify at least two points in the solution: y < 5 - 2x | x + 5y > -7