Gabrielle is 15 years younger than mikhail. the sum of their ages is 67. what is mikhail's age?

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

Amountain climber starts a climb at an elevation of 453 feet above sea level at his first rest stop he has climbed 162 feet and by his second rest stop he has climbed another 207 feet its getting late in the day so the climber starts his way down if the climber desends 285 feet how much does he need to ascend or descend to return to the original starting point