In general, when a number written in scientific notation includes a positive exponent, the magnitude of the number is a. negative b. positive c. less than one d. greater than one

Pls! does anybody know a shortcut for answering these types of questions in the future?

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

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