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F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')