Answer:
Difference of squares:
y^4−25
16x^2−81
Not difference of squares:
20m^2n^2−121
p^8−q^5
Step-by-step explanation:
y^4−25
(y²)² - 5²
16x^2−81
(4x)² - 9²
20m^2n^2−121
20 is not a perfect square
p^8−q^5
q⁵ is not a perfect square
13. Is 18
15. Is 86
17 is 5
19 is 15
21 is 24
23 is 29
Answer:
C
Step-by-step explanation:
Answer:
8
Step-by-step explanation:
Answer:
12.7
Step-by-step explanation:
