What percent of 300 is 51

Which of the following is the true for f(x) = 5cos

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?