9 Leon wrote an expression that is equivalent to (30+6) + 12. Which expression could be the one Leon wrote?
A 36 : 3.4
B (3.3.4); 4.3
C 5.6+2.3 3.2.2
D (3.3.2.2) = (3.2.2)

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

4. bob solved the inequality problem below incorrectly. explain his error and redo the problem showing the correct answer. −2x + 5 < 17 −2x + 5-5 < 17-5 -2x/-2 < 12/-2 x < -6

32a³b² 8ab² simplify the following expression.