At the World Cup, 25% of the teams are from South American countries. If there are 40 teams in the World Cup, how many are from South American countries?

What is the standard form of -5x^2+2x^4-11+x^3+3x

The school board administered a math test to all students in grade 66 at high achievers charter school and determined that 15\%15% of them were below grade level in math. based on this data, which of the following conclusions are valid? choose 1 choose 1

Aculinary club earns $1360 from a dinner service. they sold 45 adult meals and 80 student meals. an adult meal costs twice as much as a student meal. what is the cost of an adult meal?