7. 3c+3=84
3c=81
c=27
So either 81/3 but if simplified its 27/1
8. The correct answer would be 55=31+t
length of square = 18
x = side of square
x-7 = side of triangle
3(x-7) + 39 = 4x
3x-21 + 39 = 4x
3x+18 = 4x
18=x
square 18x4 =72(perimeter square)
triangle side (18-7=11)
11x3 = 33(perimeter triangle)
72-33=39
^ what they saidddddddddddddddddd
Solution :
GIven equation
To simplify this equation , we first evaluate the terms in bracket
Hence,