The value of x is 14 I think
Answer:
172 cm².
Step-by-step explanation:
Total surface area = 56 + 16 +56 + 16 + 14 + 14
So just find the measues of the faces
15 times 4=rightmost face
9 times 4=oposite face
9 times 4=lower top face
to find topmost face
15-9=6
4 times 6=topmost face
sides
can be split up into 2 rectangles
15 by 9 and 6 by 6
2 of them
2 times (15 times 9+6 times 6)
bottom=15 times 4
not seen face=6 times 4
total area=(15 times 4)+(9 times 4)+(9 times 4)+(4 times 6)+(2 times ((15 times 9)+(6 times 6)))+(15 times 4)+(6 times 4)
total area=60+36+36+24+(2 times (135+36))+60+24
total area=60+36+36+24+(2 times 171)+60+24
total area=60+36+60+342+60+24
toal area=582
answer is B
Y=6x-24
substitute 18 for y
18=6x-24
add 24 on both sides
42=6x
divide both sides by 6
7=x
6(8)+b/6
48+b/6
b/6=-48
b=-48/6
b=-288