The sum of three numbers is 74 the first number is 6 less than the second the third number is 2 times the second what are the numbers

20 ! need which shows a difference of squares? 10y^2-4x^2 16y^2-x^2 8x^2-40x+25 64x^2-48x+9

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?