Question on picture, would appreciate

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

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.