I need help with number 5 please!!

Which shows one way to determine the factors of 4x3 + x2 – 8x – 2 by grouping?

What does independent variable and dependent variable mean in math?

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