Triangle FED is a dilation of triangle ABC What is the scale factor used to transform ABC into FED?

Explanation:

The order of the letters in ABC and FED is important. This is because AB pairs with FE. Note how AB is the first two letters of ABC, and FE is the first two letters of FED.

Divide the lengths of FE over AB to get the scale factor:

FE/AB = 20/15 = 4/3

Or you could pick on BC and ED (both are the last two letters of ABC and FED respectively) to get

ED/BC = 8/6 = 4/3

Finally, you could also say

FD/AC = 16/12 = 4/3

In short, we could have any of the following:

Therefore, the scale factor is 4/3

Because 4/3 = 1.33 (approx) is larger than 1, this means the image triangle FED is larger than the preimage triangle ABC.

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.

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation: