Two students were given the expression shown to simplify.

use the drop-down menus to complete the statements about whether each student's answer is an equivalent expression. then choose an expression that is equivalent.

math item stem image
clear check
sergio: 9−(−3x)
sergio's expression is because .

leon: 9+3+6x
leon's expression is because .

equivalent expression

a correct equivalent expression is .

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Which of the following is a solution of z^6 = 64i? 2(cos105° + isin105°) 2(cos120° + isin120°) 2(cos135° + isin135°) 8(cos15° + isin15°)

What is the graph of the absolute value equation ? y=|x|-5