Final answer:
Without complete equations or contexts for the values of 'a', 'b', and 'c', we cannot determine a solution to the student's system. Typically, such values would be substituted into a formula, such as the quadratic formula, to solve for unknowns.
Step-by-step explanation:
The student appears to be asking for a solution to a system of equations or a specific solution to a mathematical problem, but there are multiple incomplete scenarios provided with different values of 'a', 'b', and 'c' indicating the possible use of the quadratic formula or another algebraic formula involving velocity. Without the full context of each scenario or the corresponding equations, it is impossible to provide a definitive solution.
Typically, with a given set of constants and a formula, one can substitute these values into the formula to solve for the unknown. In the last provided example, if we assume that the equation is a quadratic equation in standard form ax2 + bx + c = 0, using the quadratic formula x = (-b ± √(b² - 4ac))/(2a), one could substitute a = 1, b = 0.0211, and c = -0.0211 to find the roots. But without the equations that these values correspond to, solutions cannot be determined.