At a stop in New York City, 50 people board a subway every 10 minutes. After how long will 250 people have boarded a train at that stop? A. 20 minutes B. 40 minutes C. 50 minutes D. 1 hour

C. 50 minutes

Step-by-step explanation:

each time, 50 people can aboard. to calculate how many times people aboard, divide 250 by 50, equals 5

each time to aboard takes 10 minutes, so multiply 5 by 10 equals 50minutes.

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

the one below it is a function