exam Maths Puzzle Numerical Ability

Please help me solve for c for this equation: {{{ 7.5a+.5b-3.5c=6.5 }}} {{{ 2.5a-3b+4c=5 }}} {{{ 1.5a-5b+2c=-11 }}}

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what are the steps to solving a radical function, linear function, exponential function, and absolute value function in order????? my question is for a paraellogram abcd to construct ae perpendicular to cd and to construvt df perpendicular to ab and to name the figure you constructed