7.5 x 10^1
7.59
It is not necessary to capitalize the word "yo".
First person singular of the verb "usar". "Uso". You can use the personal pronoun "yo", but it is not really necessary.
That system makes it much easier to write the numbers, remember them, tell them to others, and notice mistakes when they're written wrong.
why do yo think that the aims of education are necessary
It means, "I have the coffee." It's not necessary to use the pronoun. "Tengo el café." is adequate.
Scientific notation lets us express a large or a small number without having to write a lot of zeros before or after it. Many constants in physics, for example, are too cumbersome to write without scientific notation. It is easy to make mistakes (in the number of 0s) and you would not be able to enter them into your calculator. For example: Avogadro's constant: 6.022*1023 Planck's constant: 6.626*10-34 Joules second etc.
Girl/worman Speaking to the parent (Formal) - (Yo) Soy su niñera To a child or informally - (Yo) Soy tu niñera Boy/man would use the word "Niñero" Using Yo (I) is not really necessary since "Soy" means "I am" but it can be said with or without the Yo and be correct.
(Yo) soy muy independiente ('Yo' ('I') only necessary for emphasis/identification)
When you break yo neck
plastic and string