At which latitude would you expect to find the most abundant fisheries? 0 10 30 50 70

That would be at 10-degree latitude. unlike at 0 degrees, the land mass area at this latitude is smaller and this region is tropical where there is an abundant all year round exposure to sunlight unlike the temperate regions between the 30-70 degree.

To solve this integral, what you can do is split it up as follows: (1) ∫40(x2−4)dx=∫40(x2)dx−∫40(4)dx. to integrate  4  as an  indefinite integral, a good rule of thumb is  by  an equation below  for  polynomials; . (2) ∫xa=xa+1a+1+c , where a is any number. c denotes some constant that is crucial when doing 

This is called visual imagery. it is a memorization technique wherein an idea or a term is associated with an image, this in remembering ideas, especially as humans are very visual learners. this is also why visual aids a lot for memory retention.