5 + x = 7.5 what is x?​

Solve the inequality. write the inequality in interval notation. 9(t-2)> 3(t-7)

Umm.. just started this 2day and its not on my notes(p′︵‵。)

Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!