Answer:
-77
Step-by-step explanation:
77+77=154 wrong
77+(-77)=0 right
77+0=77 wrong
77+(-76)=1 wrong
Answer: 1st one
Step-by-step explanation:
Responder:
Altura = 26
Base = 20
Explicación paso a paso:
Dado que :
Dejar :
Base = b
Altura = 6 + b
Área del rectángulo = base * altura
520 = b * (6 + b)
520 = 6b * b²
b² + 6b - 520 = 0
b² + 26b - 20b - 520 = 0
segundo (segundo + 26) - 20 (segundo + 26) = 0
b + 26 = 0
b = - 26
b - 20 = 0
b = 20
Ignorar negativo
b = 20
Altura = 20 + 6 = 26
X/40 = 7/20
40/20=2
x=7x2=14
14 red marbles
Hope this helps.
formula for polyhedrons is V-E+F=2
F= faces = unknown F
V= vertices=F-8
E= edges=30
(F-8)-30+F=2
add the 2 F's and 30 & 8 so you get 2F-38=2
ince -38 doesn't have variable move it to other side by adding 38 to both sides
2F=38+2 which becomes 2F=40
now divide both sides by 2 to get F=20 so there are 20 faces