Answer:
a) ∅ ∈ {∅} TRUE
b) ∅ ∈ {∅,{∅}} TRUE
c) {∅} ∈ {∅} FALSE
d) {∅} ∈ {{∅}} TRUE
e) {∅} ⊂ {∅,{∅}} TRUE
f ) {{∅}} ⊂ {∅,{∅}} TRUE
g) {{∅}} ⊂ {{∅},{∅}}FALSE
Step-by-step explanation:
To assess whether these statements are true or false, first observe the symbol:
"∈" means that element, as it is and as it is, belongs to the set. To belong to the set it must be within the symbols "{}"
On the other hand, the symbol "⊂" means "subset", that is, it is a subset that is included in the main set.
So:
c) is false because "{∅}" is not included in the set
g) is false because " {{∅}}" is not included in the set
The answer would be: t= -5/4
Answer:The better option would be the $6.75 per square foot plus a $100 fixed installation fee.
Step-by-step explanation:
B1= 330 ft
B2= 180 ft
B3= 156 ft
Total sq is 666
666 * 6.75 + 100= $4,595.5
666 * 7.25= 4,828.5
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Answer: D
Step-by-step explanation:
A counterexample is an isosceles trapezoid.