Which of the following expressions is a polynomial? A. F(x)= -3x^4+8x^2-2 square root x+1 B. F(x) -2.1x^7+3x^2+17/2x C. F(x)= 4/x-11x^2 D. F(x)= -1/5x^2+4.5x+2^x

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

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Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.