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You can put this solution on YOUR website!
a cellular phone tower services a 20 mile radius.
\n" ); document.write( " A rest stop on the highway is 5 miles east and 12 miles north of the tower.
\n" ); document.write( " If you continue driving due east, for how many miles will you be in range of the tower?
\n" ); document.write( ":
\n" ); document.write( "Let x = no. of miles east of the rest stop to max range (20 mi from center)
\n" ); document.write( ":
\n" ); document.write( "Draw a diagram.
\n" ); document.write( "A circle, draw inside a rectangle 12n by 5w, lower left corner is at the center.
\n" ); document.write( "The upper right corner is the rest stop, label the line from rest stop to a
\n" ); document.write( "point on the circumference as x, from this same point a radius line to the center.
\n" ); document.write( "This is a right triangle we can solve; a^2 + b^2 = c^2
\n" ); document.write( "a = 12
\n" ); document.write( "b = (x+5)
\n" ); document.write( "c = 20
\n" ); document.write( ":
\n" ); document.write( "12^2 + (x+5)^2 = 20^2
\n" ); document.write( "144 + x^2 + 10x + 25 = 400
\n" ); document.write( "x^2 + 10x + 144 + 25 - 400 = 0
\n" ); document.write( "A quadratic equation
\n" ); document.write( "x^2 + 10x - 231 = 0
\n" ); document.write( "Factors to
\n" ); document.write( "(x-11)(x+21) = 0
\n" ); document.write( "x = 11 mi east from rest stop to max range point \n" ); document.write( "