Which equation correctly uses the law of cosines to solve for y?
a) y^2 = 9^2 + 19^2 -2(y)(19)cos(41*)
b) y^2 = y^2 + 19^2 -2(9)(19)cos(41*)
c) y^2 = 9^2 + 19^2 -2(y)(19)cos(41*)
d) 9^2 = y^2 + 19^2 -2(y)(19)cos(41*)

The appalachian trail is a hiking trail that passes through the appalachian mountains. three members of a teen hiking group hiked a section of the trail. the hikers stopped at a rest area and equally shared 3 4 gallon of water. how much water did each person get?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much