An entrepreneur estimates his total profit (total revenue minus total cost) for his proposed company as p(x) = x3 ? 4x2 + 5x ? 20, where p is in hundreds of dollars and x is number of years the company has been in business. in which year (x) will the entrepreneur break even? a. year 1 b. year 2 c. year 3 d. year 4

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec