The daily July surface temperature of a lake at a resort has a mean of 82 degrees and a standard deviation of 4.28. If
you prefer to swim when the temperature is at least 77.8
degrees, about what percent of the days does the
temperature meet your preference? Round to the nearest
percent.

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

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)

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?