Tanvi tried to evaluate the expression 7 x [(19 - 1) = 2]. Here is her work: 7 x [(19 - 1) = 2]
= 7 x [18 - 2]
Step 1
= 7 X9
Step 2
= 63
Step 3
Is Tanvi's work correct?
No, Tanvi made a mistake in Step 1. Tanvi subtracted before she multiplied.
The order of operations says to multiply before you subtract.
No, Tanvi made a mistake in Step 2. Tanvi divided before she multiplied. The
order of operations says to multiply before you divide.
Yes, Tanvi's work is conhect.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)