Which of the following is an advantagre to using tables

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.