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• select all the correct answers. an electronics store chain sells headphones. the company is about to introduce a new headphone model that is expected to sell very well across its various stores. these are the projected revenue and cost functions for the headphones: r(x) = -210x2 + 6,970x c(x) = -170x + 39,690 which two statements are true? the maximum profit is $57,834. the maximum profit is $21,000. a selling price of $27 results in the maximum profit. a selling price of $17 results in the maximum profit. a selling price of $16.60 results in the maximum profit.
  
• which salt is produced when h2so4 reacts with naoh? k2so3 na2so4 na2so3 k2so4
  
• how did the catholic church practice of selling indulgences contribute to the reformation
  
• which of the following is an extraneous solution of (45 minus 3 x) superscript one-half baseline = x minus 9?
  
• which of the following fluid compartments is not a partner in immune function?
  
• what is the safest way to carry a microscope? one student should hold onto the base and one student should grasp the arm. two students should hold opposite sides of the microscope base. place one hand under the base and grasp the arm with the other hand. place both hands securely around the base of the microscope.
  
• what is the range of y = log subscript 8 baseline x?all real numbers less than 0all real numbers greater than 0all real numbers not equal to 0all real numbers
  
• pamela is selling cookies. she charges 75 cents for each cookie, with the ingredients costing $2.00 per dozen. the cookies are only sold by the dozen. her profit is represented by the equation p = 7d. what does the domain of the function represent? which values in the domain are relevant to the amount of profit? responses a profit per dozen; d ≥ 0.75profit per dozen; d ≥ 0.75 b number of dozen sold; d ≥ 0number of dozen sold; d ≥ 0 c number of dozen sold; d ≥ 1number of dozen sold; d ≥ 1 d profit per cookie; d ≥ 0.75
  
• in this excerpt from ""she walks in beauty"" by lord byron, which two phrases build up the theme of contrast and balance in beauty? she walks in beauty, like the night of cloudless climes and starry skies; and all that’s best of dark and bright meet in her aspect and her eyes; thus mellowed to that tender light which heaven to gaudy day denies. one shade the more, one ray the less, had half impaired the nameless grace which waves in every raven tress, or softly lightens o’er her face; where thoughts serenely sweet express, how pure, how dear their dwelling-place.
  
• matilda has a 100 g rock sample. she knows that the rock contains uranium-238 and that the half-life of uranium-238 is 4.5 x 109 years. if she cuts the rock sample in half, what happens to the half-life of the uranium? the half-life increases. the half-life decreases. the half-life remains the same.