How do u simplify square root of 363 minus 3 square root of 27

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

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