<span> now were going to factor out 130, and according to that principle, any numeral needs a pair to be pulled to the outside of the radical. </span>
<span>130 breaks down to 10 x 13 </span> <span>13 is prime so leave it, 10 breaks down to 5 x 2. </span> <span>We have 13 x 5 x 2 and no pairs. Sqr root of 130 is already as simplified as possible. Use a calculator for an approximation. 11.40 </span>
So they went 190 minutes over her allowed 600. Multiply 190x .25 (price per minute and number of minutes) to get 47.5 and then add that to 40 (the monthly charge. $87.50 is her bill for the month.
