Serena parachutes from a plane at a height of 20,000 ft above sea level. several minutes later she lands on the ground 15 ft below sea level . what was the total vertical distance that serena parachuted?
explain : )

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?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Which expression is equivalent to 16 in exponential form? a) 4 × 4 b) 8 × 2 c) 23 d) 24