If the measure of an angle is 7x + 51 find the values of X for which the angle is a right angle

Kevin has just finished paying off his loan. he was assessed a service charge of $422. he paid off the principal and the interest by making weekly payments of $36.13 for four years. if the principal was $7,150, how much did kevin pay in finance charges, to the nearest dollar? a. $498 b. $365 c. $422 d. $787

What signals you that factoring by grouping is the best method to use when factoring a problem?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?