Hugo multiplico un número por 2 y le sumó 38 mariano multiplicó ese mismo numero por 7 y le sumo 3 ambos obtuvieron el mismo resultado ¿ de que numero se trata?

What is the number 321,000,000 in scientific notation? also what is the number? ?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Hell . what are the solutions to `10x^2 - 38x - 8 = 0`? is this when i find the factors and use the numbers within the factors to determine the zeros? i hope that made sense lol