## Algebra and Trigonometry 10th Edition

Least score required on the fourth test: $187$
Maximum score I can get: $3\times100+200=500$ To get an A: $90$% of $500$ $0.9\times500=450$ My scores on the first three tests: $87,92,84$ Total: $87+92+84=263$ Least score required on the fourth test: $450-263=187$