document.write( "Question 206212: Please help, I am having problems with this one, thanks\r
\n" ); document.write( "\n" ); document.write( "Media services charges $40 for a phone and $20/month for its economy plan. The equation C= 20t + 40 describes the total cost, C, of operating a media service phone for t months. the total cost for 4 months of service is $____.
\n" ); document.write( "If a customer has only $90 available, how many months of service can she receive? Would it be 3, 2 1/3, 2 1/2 or 2? \n" ); document.write( "
Algebra.Com's Answer #155804 by nerdybill(7384)\"\" \"About 
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Media services charges $40 for a phone and $20/month for its economy plan. The equation C= 20t + 40 describes the total cost, C, of operating a media service phone for t months. the total cost for 4 months of service is $____.
\n" ); document.write( "If a customer has only $90 available, how many months of service can she receive? Would it be 3, 2 1/3, 2 1/2 or 2?
\n" ); document.write( ".
\n" ); document.write( "The problem gives you the \"cost\" as a function of 't' (months):
\n" ); document.write( "C(t) = 20t + 40
\n" ); document.write( "where t is the number of months
\n" ); document.write( ".
\n" ); document.write( "For 4 months then:
\n" ); document.write( "C(t) = 20t + 40
\n" ); document.write( "C(4) = 20(4) + 40 = 80 + 40 = $120
\n" ); document.write( "the total cost for 4 months of service is $120
\n" ); document.write( ".
\n" ); document.write( "If a customer has only $90 available:
\n" ); document.write( "C(t) = 20t + 40
\n" ); document.write( "90 = 20t + 40
\n" ); document.write( "50 = 20t
\n" ); document.write( "50/20 = t
\n" ); document.write( "5/2 = t
\n" ); document.write( "or
\n" ); document.write( "2 1/2 months = t \n" ); document.write( "
\n" );