A geologist drew a scale drawing of a section of a quartz layer she saw in a cliff. The scale drawing of the layer is 2cm high and 24cm long. If the actual layer is 0.15m high, what is the actual quartz layer section she saw?

1.8 m

Step-by-step explanation:

the scale drawing of the quartz layer is 2 cm high and 24 cm long.

As sen, the height of layer is 0.15 m

it means, the height 0.15 m is equivalent to 2 cm.

So, 2 cm is equivalent to 0.15 m on scale

1 cm is equivalent to 0.15 / 2 = 0.075 m

On scale  length of the quartz layer = 24 cm

Thus, the actual length of the quartz layer = 24 x 0.075 m = 1.8 m

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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.