8n+9= -n+5? what is the value of n in the equation

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

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss

Graph each quadratic function and identify its key characteristics. f(x) = x^2 - 2x - 3