Step-by-step explanation:

Answer:
Step-by-step explanation:
10n^2 +4n+15n+6 [Add the like terms]
10n^2 +19n +6
Hope this helps!
Mark brainliest if you think i helped! Would really appreciate!
63.5 if u want working out let me know
Answer:L=4 W=15
Step-by-step explanation:
P=2L+2W
38-8=30
If length is 8 less than twice the width and the perimeter is 38, then subtract 38-8 which is 30, then divide 30 by 2 to get 15.
P=2(4) +2(15)
P=38