What is the rate of change of y=9x

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Is the power produced directly proportional to the wind speed, give reasons for your answer?

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.]