Monifer used substitution to solve this system of equations. Which equation could be the result of her
first step?
3a + b = 225
b = a - 15

options:
3a + a = 225
3a + a - 15 = 225
b= 3a + b
3a + b = a - 15

Carson has only $20 bills and $10 bill in her wallet. the total value of the bills is $50. she has 1 more $20 bill than $10 bills. how many each kind of bill does carson have? a. one $20 and two $10 bills b. two $20 bills and one $10 bill c. one $20 bills and three $10 bills d. two $20 bills and two $10 bills

Which segments are congruent? o jn and ln o jn and nm o in and nk onk and nm

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.