Which statement best describes how the arrival of horses affected north america? a) it allowed the iroquois tribes to develop a common language. b) it allowed the southeastern tribes to develop new ways to farm. c) it allowed the plains tribes to better hunt buffalo. d) it allowed the arctic tribes to begin trading with other tribes.

C) It allowed the Plains tribes to better hunt buffalo

This is because they could ride the horses to round up the buffalo and herd them quicker and more efficiently.

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering