On this number line, zero represents sea level. plot the following points based on the description provided.

number line from −5 to 5
1.5 above sea level
absolute value of −4.5
−2
opposite of 4
absolute value of 1
2.5 below sea level
greatest common factor of 8 and 12
–(−3)
−3.5
opposite of −5

this the number line: number line from −5 to 5

I’m stuck on this i don’t understand.

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

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)