Answer:

Step-by-step explanation:
The difference between two consecutive elements is 11.

Hence 
Multiple 15 by 6, the answer is 90 square cm
Answer:
5
Step-by-step explanation:
(-8)-(-13)= 5
Answer:20
Step-by-step explanation:
Answer:
Perimeter is 8x²y+26x
Area is 52x³y
Step-by-step explanation:
The perimeter is 2W+2L and area is LW
Perimeter:
2(4x²y)+2(13x)
8x²y+26x
Area:
(4x²y)(13x)
52x³y