Luis is saving money to purchase a new video game. he has a total of 30 coins consisting of nickels and dimes. the value of the coins is $2.20. let n represent the number of nickels and let d represent the number of dimes. which system of equations can be used to determine the number of nickels and the number of dimes luis has?

Which triangles could not be similar to triangle abc ? triangle a b c where angle b is a right angle. side a b is 15 cm. side b c is 8 cm. side a c is 17 cm. select each correct answer. right triangle g h i with right angle at h. g h is 77 centimeters. g i is 85 centimeters. h i is 36 centimeters. right triangle j k l with right angle at k. j k is 60 centimeters. j l is 68 centimeters. k l is 32 centimeters. right triangle m n o with right angle at n. m n is 35 centimeters. m o is 37 centimeters. n o is 12 centimeters. right triangle d e f with right angle at e. d e is 22.5 centimeters. d f is 25.5 centimeters. e f is 12 centimeters.