Han is multiplying 10x4 by 0.5r and gets 5x? . he says that 0.5r is not a polynomial
because 0.5 is not an integer. what is the error in han's thinking? explain your
reasoning

The linear combination method is applied to a system of equations as shown. 4(.25x + .5y = 3.75) → x + 2y = 15 (4x – 8y = 12) → x – 2y = 3 2x = 18 what is the solution of the system of equations? (1,2) (3,9) (5,5) (9,3)

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min