A pyrotechnician plans for two fireworks to explode together at the same height in the air. Firework A travels at 320 ft/s and Firework B travels at 180 ft/s. Firework B is launched 0.25 seconds before firework A. How many seconds after firework B launches will both fireworks explode?

How many zeros does the function f(x)=4x3-x2+1 have

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.