book Maths Puzzle Numerical Ability

Tina wants to save money for school. Tina invests $400 in an account that pays an interest rate of 8%. How many years will it take for the account to reach $5500? Equation is

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accountant A can balance books twice as fast as accountant B. Together it takes 6 hours to complete a job. How long would it take A to complete the job alone?

please show work Find an equation of the line passing through the two points. Write the equation in standard form. (8,2) and (3,6)