Achemist needs a 70% solution of tannic acid. how much distilled water must he add to 5 gallons of a 90% solution of acid to obtain the 70% solution?

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

Find the distance between c and d on the number line c=3 and d=11

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90