Ms harris has a taco stand. she has found that her daily costs are approximated by the following equation:

c(x)=x^2-40x+610

c= the cost in dollars to sell 'x' units of tacos.

a. find the number of units of tacos she must sell to minimise her cost.

b. find the minimum cost.

show full working out

this is calculus

On traditional maps, earth is represented in a flat plane, or by euclidean geometry. however, a globe is a more accurate model that comes from elliptical geometry.how does a globe represent the fact that there are no parallel lines in elliptical geometry? the equator is not parallel to any other latitudinal lines. the north and south poles are never connected by a geodesic. the geodesics connecting the north and south poles never intersect. the geodesics connecting the north and south poles intersect at both of the poles.