Uma sala com formato de trapézio, determine uma área dessa sala.
1 ponto
Imagem sem legenda
(a) 10,4 m²
(b) 25,6 m²
(c) 12,8 m²
(d) 15,2 m²

The image of the room is in the attachment.

(c) 12.8 m²

Step-by-step explanation:

The area of a trapeze is calculated as:

A =

where:

B is bigger side

b is smaller side

h is height of trapeze

From the image, we have:

B = 3.8m

b = 2.6m

h = 4m

A =

A = (3.8+2.6).2

A = 12.8

The area of the trapeze is A = 12.8 m².

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

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step-by-step explanation:

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