Halfway between 3.0 and 3.1

2 decimal places

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Atransformation t : (x,y) (x-5,y +3) the image of a(2,-1) is

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