Which actions are evidence that a chemical reaction has occurred? Select five options.
a change in color
the formation of a precipitate
a clear liquid becoming cloudy
a change in shape
the formation of bubbles
the formation of smoke
Mark this and return
Save and Exit
Next
Submit

What is the value of x when x + 7 = 21?

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]