in a class of 55 students, some study at least one of the following subjects; statistics, economics and English. 20 study none of them. The following gives further details of the subjects studied. statistics only 4, economics only 5, English only 7, all three subjects 3, statistics and English 7, economics and English 8

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.

- (2, -7)

- lines r and s and lines t and u must be parallel