Roberto invested a total of $1, part at 6% and part at 9% . how much did he invest in the higher interest account if the total interest earned in one year was $810?

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?

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Why is studying fractions important