19,7,and 61 im not sure about the last one
Answer:
1386 cm²
Step-by-step explanation:
Here's your answer!
Hope it helps :)
This should be recognized as the difference of perfect squares which is of the form:
(a^2-b^2) and the difference of squares always factors to:
(a-b)(a+b) in this case:
(3x-8)(3x+8)