Write the ratio 15:4.5 in its simplest form​

(60 points) explain this in detail

Solve: 25 points find the fifth term of an increasing geometric progression if the first term is equal to 7−3 √5 and each term (starting with the second) is equal to the difference of the term following it and the term preceding it.

What is the value of the discrimination for the quadratic equation 0=×2+2+×2