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If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

Can someone me with my math problem pls my teacher is on my back about this

Milk and ice cream are mixed together for a recipe. the total volume of the mixture is 1 cup. if the milk contains 2% fat, the cream contains 18% fat ,and the mixture contains 6% fat ,how much cream is in the mixture