briana has earned the following test grades: 82%, 75% and 90%. She wants to maintain an 85% average for her test scores. what must she receive on the final test in order to acieve this goal?

93%

Step-by-step explanation:

Formula for calculating average = sum of data / total number of data

Step 1: Add all percentages

Let the percentage on the last test be x

82% + 75% + 90% + x = 247% + x

Step 2: Apply the formula

Average = sum of percentages / total number of tests

85 = 247 + x / 4

340 = 247 + x

x = 340 - 247

x = 93%

Therefore, Briana must receive 93% on her final test to maintain an average of 85%.

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