<PRE><B>Question 822550</B>
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grade after first test and final project:
(0.35*64 + 0.30*100)/0.65 = 80.6%
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final grade needed:
35*64 + 30*100 + 35f = 100*75
35f = 100*75 - 35*64 - 30*100
f = (100*75 - 35*64 - 30*100)/35
f = 64.6%
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php</PRE>