Answer:
24
Step-by-step explanation:
use Pythagoras theorem
a^2 + b^2 = c^2
18^2+b^2=30^2
b^2 = 30^2 - 18^2
b = √576 =24
2(7x-y) + 2(3x+4y)
C
Its C
Answer:91
If the best grade is 100,91 is it.
