Answer:
Alicia needs to score 91 on her last test in order to average 80 on her tests.
Explanation:
To find out what score Alicia needs on her last test in order to average 80 on her tests, we can use the formula for average: Average = (Sum of scores) / (Number of scores) In this case, Alicia has taken 4 tests and her average is 80. So, we can set up the equation: 80 = (77 + 86 + 66 + 80 + X) / 5 where X represents the score she needs on the last test. To solve for X, we first multiply both sides of the equation by 5 to remove the denominator: 400 = 77 + 86 + 66 + 80 + X Next, we combine like terms on the right side: 400 = 309 + X To isolate X, we subtract 309 from both sides of the equation: 400 - 309 = X Simplifying further, we find: X = 91