In an international track competition, there are five united states athletes, four russian athletes, three french athletes, and one german athlete. how many rankings of the 13 athletes are there when 1. only one nationality is counted?

2. only nationality is counted and all the U. S athletes finish ahead of all the Russian athletes

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step-by-step explanation:

true

step-by-step explanation:

intersecting chords are just lines that intersect. so a line is equal to 180 degrees, so when it is intersected by another chord, then it create supplementary angles, and because the lines cross, vertical angels are also formed.

answer: $53750

steps:

list the principal and interest after the n-th year:

n       principal   simple interest

1     12500     375

2     25000     750

3     37500     1125

4     50000     1500

sum: $50000     $3750

total at end of year 4: $53750