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Kruka [31]
3 years ago
12

I NEED HELP ASAP!!!!

Mathematics
1 answer:
Degger [83]3 years ago
4 0
I hope this helps you!

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Of the 100 entries in a costume contest, 39 entrants were dressed as heroes and 45 entrants were wearing a mask. If 21 entrants
ehidna [41]

Correct question with correct options has been attached

Answer:

37

Step-by-step explanation:

Let C represent those dressed as heroes and let B represent those wearing mask

Thus;

n(C) = 39

n(D) = 45

We are told that 21 entrants were dressed as heroes wearing a mask.

Thus; n(C n D) = 21

We are also told that there were a total of 100 entries.

Thus, n(T) = 100

Now, number of entrants neither dressed as heroes nor wearing a mask is given by;

n(T) - n(C u D)

n(C u D) = n(C) + n(D) - n(C n D)

n(C u D) = 39 + 45 - 21

n(C u D) = 63

Thus;number of entrants neither dressed as heroes nor wearing a mask is: 100 - 63 = 37

3 0
3 years ago
Simplify: (3x^2-5x +9)+(7x^2+8x-5
Ber [7]

Answer:

=10x2+3x+4

Step-by-step explanation:

I hope this helps you

6 0
3 years ago
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Only do question 8<br><br> 50 points<br><br> Topic: Percentage
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Answer:

see below

Step-by-step explanation:

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Solve the equation <br><br> 2.9=7.1 + y
lidiya [134]

Answer:

y=-4.2

Step-by-step explanation:

2.9=7.1+y

2.9-7.1=7.1-7.1 +y

-4.2=y or y= -4.2

6 0
3 years ago
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Maru [420]

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