exam Maths Puzzle Numerical Ability

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?

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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 My 5th grade daughter has the following problem, that I cant figure out.
Insert Parentheses where necessary to make the number sentence true:
500/10^2+3*6=118