Aperson earns $187.42 before deductions for 3 days work . what is the rate of per hour assuming 8 hours of work per day ?

How do you use the elimination method for this question? explain, because i really want to understand!

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?

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)