a gallon of milk cost $0.82 in 1960.in 2015 ,it cost 0.03 more than 4 times the cost in 1960,how much did a gallon of milk cost
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(7x²y³)(3x⁵y⁸)
Multiply by ADDING exponents with the same base:
(7 * 3) (x² * x⁵) (y³ * y⁸)
21 * x² ⁺ ⁵ * y³ ⁺ ⁸
Simplify:
21 * x⁷ * y¹¹
21x⁷y¹¹