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Step-by-step explanation:

área = 6 lados ^ 2
volumen = lado ^ 3
caras rato es 2: 5
la proporción de áreas es 2: 5
para volúmenes,
longitud de 1 lado = √2: √5
cubo que
2√2: 5√5
la relación de volúmenes es 2√2: 5√5
Combine like terms on the right side:


Add 9 to both sides:

Divide both sides by 5 to get x by itself:

The value of x is
7.
Answer:
Step-by-step explanation:
1-x²≥0
1≥x²
or x²≤ 1
-1≤x≤1
[if x²≤a,then -a ≤x≤a]