A random sample of 48 devices was selected from a warehouse and in turn randomly divided into three groups of 16. Group A was the control group so nothing was done to the devices. Group B devices were submerged in water for 15 minutes. Group C devices were dropped to a cement floor from 5 feet. Each device was then evaluated for performance (the lower the score the better). Does there appear to be any measurable effect of immersing them in water or dropping them

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)

Ineed to know how to write question one in mathematical terms

Mr. thompson took five of his children to the bowling alley the cost for children 12 and older is 350 the cost of four children under 12 inch to 25 he spent a total of 1625 how many of his children are 12 and order