Respuesta :
Silvia has to score a 101 to get an average of 90 for all four tests.
Explanation: 90=(86+81+92+x)/4
360=259+x
101=x
Explanation: 90=(86+81+92+x)/4
360=259+x
101=x
90 * 4 = 360 (total of 4 tests for average of 90)
86 + 81 + 82 = 259 (total first 3 tests)
360 - 259 = 101
answer:
In order to have an average of 90, she must score 101 on her 4th test.
86 + 81 + 82 = 259 (total first 3 tests)
360 - 259 = 101
answer:
In order to have an average of 90, she must score 101 on her 4th test.
