exam Maths Puzzle Numerical Ability

The sum of the digits of a 2-digit number is 7. If 27 is added to the number, the resulting number has the same digits in the reverse order. What is the number?

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exam Other Question

Please help me solve this:

Suppose $1000 is invested at an annual rate of 5.7% compounded continuously.

A.What is the ammount after 6 years?
B.How long would it take for the ammount in the account to quadruple? describe the resulting graphs by identifying the vertex point, the graphs direction and any axis intercepts gleaned from the table or graphs

y = 2x^2