Which expression can be used to show a set of thirty books divided into five groups?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Find the volume of the described solid. the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x. a) 441b) 147c) 864d) 882

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?