Solve each equation algebraically using if–then statements to justify each step. 1. 5 + 4 = 19

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

2.5 milligrams is equivalent to how many grams

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?