need help with part (B) Also $1.11 Is incorrect for (B) too

n(x)=1+8x+2x20.6x3 (a) Find n(1) and n(3). n(1)=n(3)= Interpret the results. With $100,000 invested in R&D, the number of new products per $100,000 is increasing at a rate of new products per $100,000 per $100,000, and with $300,000 invested in R&D, it is decreasing at a rate of new products per $100,000 per $100,000. cent.)