Combine like terms and simplify 6x^2+3y^2+4y^2-2x

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!

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Is it greater than or less than7*3_9*2