book Maths Puzzle Numerical Ability

CAN YOU PLEASE GIVE ME THE ANSWER FOR 7a to the third power-2a squared+6-7a squared+2a-4

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can you show me the steps of answering this problem?

Jim's wekly pay is two thirds of Alicia's. Together they earn $600 per week. What is each person's weekly pay?

Please and The simle interest I on a princial of P dollars at interest rate r for time t, in years, is given by I = Pri. Find the simple interest on a principal of $6000 at 3 3% for 2 years.

I know that 3% is 0.03