Please answer all the questions that you can answer! (Also ignore my work next to the question because it is probably wrong)

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −

The function below is written in vertex form or intercept form. rewrite them in standard form and show your work. y = (x+4)(x+3)