6. What is the slope of the curve y curve at x=1 (3x-5) at x = 1? Write the equation of the line tangent to this 7. A manufacturer estimates that the hourly cost of producing x units of a product on an assembly line is C(x) = 0.1x36x + 136x + 200 dollars. a) Compute C(21) - C(20), the extra cost of raising the production from 20 to 21 units b) Find the marginal cost when the production level is 20 units