The sum of the ages of Jenny and her younger brother Joey is 16, and the difference of their ages is 2. Write and solve a system of equations to determine their ages. HEL

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Jamie is hiking up a small mountain. he climbs up at a constant rate of 300 feet/hour until he reaches the peak at 1,500 feet. after that, he hikes down at the same rate to the base of the mountain. the equation that models jamie’s elevation, e, after t hours is e = . jamie’s elevation will be 600 feet after hours and after hours.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)