Help please zearn is so hard

Hannah is 3 years older than twice her brother joey’s age. joey is 2 years old. how old is hannah? show all of your work! the number of students is five more than seven times the number of teachers. there are 10 teachers. how many students are there? be sure to show all of your work!

Do you mind if you guys me with this question i’m on number 8

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25