The sum of (3 - 51) + (-2+81) is

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab

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