exam Maths Puzzle Numerical Ability

jan invested $1200 at a certain simple interest rate and $2200 at a rate 3% higher. her annual earnings were $253. find the two interest ratesif earned $121 more on the larger inve

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The problem I am trying to solve is: M/p2k + 4a/3pk - 6/5pk2 (slash indicate division sign and the numbers 2 on the bottom indicate exponents). I have solved as to the point of 15p A toy rocket is launched from the ground with an initial velocity of 80 feet per second. The height h of the rocket after t seconds is given by the equation h=80t-16t^2. How long after it is launched will the rocket be at its highest point?