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aleilyg2005
02.08.2019 •
Mathematics
Lindsay sells copy machines which come in standard and enhanced models. the standard model sells for $210 and the enhanced model sells for $265. if lindsay sold a total of 19 units and took in $4,485, how many of the standard model did she sell?
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Ответ:
.. s + e = 19 . . . . . . . . . . . . . . . Lindsay sold a total of 19 units
.. 210s +265e = 4485 . . . . . . Lindsay took in $4,485
Since you want to know s, you can use the first equation to write an expression for e in terms of s.
.. e = 19 -s
Substitute this into the second equation.
.. 210s +265(19 -s) = 4485
.. -55s + 5035 = 4485 . . . . . . eliminate parentheses
.. -55s = -550 . . . . . . . . . . . . . subtract 5035
.. s = 10 . . . . . . . . . . . . . . . . . . . divide by the coefficient of s
Lindsay sold 10 Standard models.
Ответ:
b 44 degrees
Step-by-step explanation:
cos x = adjacent side / hypotenuse
cos x = 15/21
cos x = 5/7
Take the inverse cos of each side
cos ^-1 (cos (x) )= cos ^-1 (5/7)
x =44.4153086
To the nearest degree
x = 44 degrees