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One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

How many solutions does the nonlinear system of equations graphed bellow have?

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?