Let's assume that Jacqueline's score on her third test is x.
To find out what score Jacqueline needs to get an average of at least 79, we can use the formula for the average of three numbers:
(84 + 77 + x) / 3 >= 79
Multiplying both sides by 3, we get:
84 + 77 + x >= 237
Combining like terms, we get:
x >= 76
Therefore, Jacqueline needs to get a score of at least 76 on her third test to achieve an average of at least 79.
Have a good night