Find integral∫cos³x dx) )?​

Afamily of five rents a kayak and splits the total time, k, equally. each family member spent less than 25 minutes kayaking. which values can be used to complete the math sentence below so that it accurately represents the situation? intro done

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Is this a polynomial function? i need to know asap