Answer:
Hey there!
She wants an 93, so we write the equation: 
Multiply both sides by 6 to get: 
Simplify: 463+x=558
Subtract 463 to get that x=95.
Thus, she must score a 95 to get a A as a final grade.
Hope this helps :)
There are several expanded forms for a decimal number. Pick the one that matches your requirements.
64,375 = 60,000 +4,000 +300 +70 +5
64,375 = 6×10,000 +4×1,000 +3×100 +7×10 +5×1
64,375 = 6×10⁴ +4×10³ +3×10² +7×10¹ +5×10⁰