I know that the value of the unshaded part is probably 6,because the entire area is 45.5x9 is 45,and 3=6 makes up 9,so the value of the unshaded part is 6.I dont really understand part b though.
Start by getting one of the equations in terms of one variable, in this case lets put the first equation in terms of y
2x+y=3 ---> y=3-2x
now we plug that into the second equation
5x-2y=12 ---> 5x-2(3-2x)=12
we can then multiply and simplify
5x-2(3-2x)=12 ---> 5x-6+4x=12 ---> 9x-6=12 ---> 9x=18 ---> x=2
we can now plug x=2 into an equation to solve for y
2(2)+y=3 ---> 4+y=3 ---> y=-1
It would be C because you have the sum will equal 60 so you would add the two amounts together and then add r to find if he has enough room. (Which he doesn't... I think)
Answer:
The measure of the sides of an equilateral triangle with a perimeter of 108 cm is 36 cm.