a textbook search committee is considering 13 books for possible adoption. the committee has decided to select 8 of the 13 for further consideration. in how many ways can it do so?

What is sin 7x/4 ? i need on this urgent trig

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )