exam Maths Puzzle Numerical Ability

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

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exam Other Question

Please help me... Divide 4x^3-3x^2+x+1 / x+2. Thank you Find the work done by the constant force 4i - 2j if the point of application moves along the line segment from P(1,1) to Q(5,7).