Pls help! Austin simplified the expression below!
determine if he is correct or not!
if he isn't explain the mistakes
and provide the correct work!
{1}{3} (2x+9)+{2}{3} (4x-3){2}{3} x+27+{8}{3}x +2{10}{3} x+29
thanks!

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.

Which pair of expressions is equivalent? a 7(1–k)and7–k b 7(1–k)and1–7k c 7(1–k)and7–k d 7(1–k)and7–7k