When was geometric sequence discovered and who made it

Geometric sequences are mostly  found in Book IX of Elements by Euclid in 300 B.C. Euclid of Alexandria, a Greek mathematician also considered the "Father of Geometry" was the main contributor of this theory. Geometric sequences and series are one of the easiest examples of infinite series with finite sums. Geometric sequences and series have played an important role in the early development of calculus, and have continued to be a main case of study in convergence of series. Geometric sequences and series are used a lot in mathematics, and they are very important in physics, engineering, biology, economics, computer science, queuing theory, and finance. It was included in Euclid's book Elements that was part of a composition of other math theories for people that became very popular because it was the first collection that showed alot of   the   main   math   theories   together   featured   simply.

The answer is d. 606 because you have to multiply 30% ( percent) times 2020 (total) to get ur answer.

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.