An airplane company is determining the difference in selling price if rows of first-class seats are added to a
new design. Using the average selling price of $1,000
per first-class seat, the total selling price for one new
row is
f(1) = 4,000r. Each row in first class eliminates two rows
of economy seats. Using the average selling price of
$150 per economy seat, the total price for each pair of
removed rows is e(r)= 1,800r.

Which is d(r) the profit or loss for adding r rows of first class seats?

A. D(r)=2,200r
B. D(r)=5,800r
C. D(r)=-2,200r
D. D(r)=-5,800r

HURRY TIMED

Acoin bank containing only dimes and quarters has 12 more dimes than quarters. the total value of the coins is $11. how many quarters and dimes are in the coin bank?

You need to solve a system of equations. you decide to use the elimination method. which of these is not allowed? 3x - 2y = 7 3x + 4y = 17 equation 1 equation 2

Design an er diagram for keeping track of information about votes taken in the u.s. house of representatives during the current two-year congressional session. the database needs to keep track of each u.s. state's name (e.g., texas', new york', california') and include the region of the state (whose domain is {northeast', midwest', southeast', southwest', west'}). each congress person in the house of representatives is described by his or her name, plus the district represented, the start date when the congressperson was first elected, and the political party to which he or she belongs (whose domain is {republican', democrat', 'independent', other'}). the database keeps track of each bill (i.e., proposed law), including the bill name, the date of vote on the bill, whether the bill passed or failed (whose domain is {yes', no'}), and the sponsor (the congressperson(s) who sponsored - that is, proposed - the bill). the database also keeps track of how each congressperson voted on each bill (domain of vote attribute is {yes', no', abstain', absent'}). additional information: