Answer:
x² - y²
Step-by-step explanation:
(-y + x)(x + y)
(x - y)(x + y)
x² - y²
Answer:
I cant see the whole thing But I think you're right
Answer: 282
Step-by-step explanation: just multiplícate it by 4
After 5 tests, her average was 88. To have a seven-test average of 90, the total must be:
Her average after 5 tests was 88. Her total score on the 5 tests is:
Subtract:
Find the average by dividing by 2:
Her average must be 95