While shopping at the mall, you have $330 to spend. You can buy pants for $20 each and t-
shirts for $15 each. When you are finished
shopping, you have bought a total of 18 items
of clothing (includes only pants and t-shirts).
How many of each item of clothing do you buy?

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what is the original number? you forgot to add it.

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.