light is gathered from a distant galaxy and one of the spectral lines of calcium is observed at 413.26 nm when it should be 393.37 nm.
(a) find the velocity of this galaxy (hint: doppler formula).
(b) find the distance to this galaxy (hint: hubble law).
note: be sure to always use the formula sheet.
14,786 km/s, 205 mpc

Which statement about the relative areas of ? abc and ? xyz is true? the area of ? abc > the area of ? xyz the area of ? abc < the area of ? xyz the area of ? abc = the area of ? xyz more information is needed to compare.

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

Need ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?