Anumber added to 12 and then subtracted by 18 equals 26. what is the number

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0

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