Henry sister is 3 years younger than Henry. The product of their age is 180.how old is Henry?

Which one ? is the answer and how to find this answer

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13