Researchers are investigating whether taking aspirin regularly reduces the risk of heart attacks. Four hundred men
participate in the study. The men are divided randomly into two groups: one group takes aspirin pills, and the other group
takes placebo pills (a pill with no aspirin in it). The men each take one pill a day, and they do not know which group they are
in. At the end of the study, researchers will count the number of men in each group who have had heart attacks.

i think the answer is seven, for if i'm being useless °ω°

step-by-step explanation:

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.