Answer:
Brady needs to earn a 95% on the final test
Step-by-step explanation:
Hello, great question. These types are questions are the beginning steps for learning more advanced Algebraic Equations.
Before we can actually solve this we need to create a formula that calculates the grade of the last test in order to get an average of 80%. Since he got a 77% average for his first 5 tests, we can multiply 0.77 by 5, add the final test and then divide by the total amount of tests taken. Like so,
.... multiply both sides by 6
... subtract both sides by 3.85
Finally, we can see that Brady needs to earn a 95% on the final test in order to increase his overall average to 80%.
I hope this answered your question. If you have any more questions feel free to ask away at Brainly.