Is -77 a rational or irrational number?

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

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

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)