How can i find and apply lcm and gcf using fractitions

Which value of c would make he following expression completely factored? 8x+cy

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

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