Nick was thinking of a number. Nick adds 9.4 to the number, then doubles the result to get an answer of 16.8. Form an equation with a from the information​

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

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

Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment