FiNAL Given: sin(A)=4/5,pie/2less than A less than pie and sin (B)=-2root5/5, pie less than B less than 3 pie/2 What is the value of cos(A – B)?

-2square root 5/25
-square root 5/5
2square root5/5
11 square roo5 /25

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.