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Burka [1]
2 years ago
10

Please help. I need this urgentlyPlease no links please​

Mathematics
1 answer:
Inga [223]2 years ago
5 0

Answer:

Look below

Step-by-step explanation:

(a) The area of a triangle is:

A=\frac{1}{2}bh

The height of this triangle is h and it's base is 4+h so...

A=\frac{1}{2}*[h*(h+4)]

A=\frac{1}{2}*(h^2+4h)\\A=\frac{h^2}{2}+2h

(b) If the height is 8 cm, then the base is 4+8 which is 12 cm so...

A=\frac{1}{2}*8*12=4*12=48 \ cm^2

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Determine whether these statements are true or false. a) ∅ ∈ {∅} b) ∅ ∈ {∅,{∅}} c) {∅} ∈ {∅} d) {∅} ∈ {{∅}} e) {∅} ⊂ {∅,{∅}} f )
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a) ∅ ∈ {∅} TRUE

b) ∅ ∈ {∅,{∅}}  TRUE

c) {∅} ∈ {∅}  FALSE

d) {∅} ∈ {{∅}} TRUE

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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

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