document.write( "Question 280428: Mary is certain that every time she parks in the municipal garage it costs her at least $2.15 if the garage charges 35 cents plus 30 cents for each half hour, how long is Mary's car parked? Mary's cost is at least $2.15 when Mary's car is parked at least ____ hours. \n" ); document.write( "
Algebra.Com's Answer #203815 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
This is not a coin problem!
\n" ); document.write( "this is a linear equation problem
\n" ); document.write( "y=.30x+.35
\n" ); document.write( "where x is each half hour parked
\n" ); document.write( "2.15=.30x+.35
\n" ); document.write( "1.80=.30x
\n" ); document.write( "180=30x
\n" ); document.write( "6=x
\n" ); document.write( "x= 6 half hours to be charged 2.15 for a total of three hours\r
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );