1. Consider three vectors u=(-1,5) v=(2.7,3.8) w=(4.2,-6). find the coordinates of vectors a)u+v
b)3u-2v-5w
c)u+v+w​

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of