you could solve most of these questions with easier methods. for example in 10:27, ignore the (37)^(1/2) and solve for the third side. You'll get 26 easily. now 26 x 37^(1/2) is the length. this question can be solved in 5-15 seconds in 8:38, just assume x-2 = u. by adding the equations we get 2u = 559, and we need to find 6u, which is 559 x 3. this qstn would take 30 seconds max. speed is really important in the SAT