What is the partial product of 19 times 20

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Acircle has a radius of 12.6cm what is the exact length of an arc formed by a central angle measuring 120