A traffic light changes every 30 seconds another traffic light changes every 40 seconds both lights just changed after how money minutes will both lights change at the same time

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?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?