Last year, the number of students in oscar's class was 20% less than the number of students in haoxi's class. this year, the enrollment in oscar's class dropped by 25% and the enrollment in haoxi's class dropped by 10%. oscar now has 6 fewer students than haoxi. how many students were in haoxi's class last year?

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:

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

or