Answer: 15x^2+6xy
Step-by-step explanation: 3x(6y−4y+5x)
(3x)(6y+−4y+5x)
(3x)(6y)+(3x)(−4y)+(3x)(5x)
18xy−12xy+15x^2
15x^2+6xy
Answer: A
(He has the side lengths in the wrong place in the cosine ratio)
= 18.60108 that’s the answer
It would be 90(4 sides)= 360 ft
or 90ft+90ft+90ft+90ft=360ft
