Manufacturing
a manufacturer's total cost is c(q) = 0.1q ^ 3 - 0.5q ^ 2 + 500q + 200 dollars when q thousand units are produced . currently , 4,000 units (q = 4) are being produced and the manufacturer is planning to increase the level of production to 4,100 . use marginal analysis to estimate how this change will affect total cost .

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?

Solve 13 + w/7= -18 (w/7 is a fraction)

Im so bad at fractions they are not my best math thing to work on