Helena invests a sum of money into an account that pays 6% compound interest per annum. Work out after how many years Helena will have trebled his investment. Give your answer as a whole number of years.

First side - 6

Second side - 15

Third side - 17

Step-by-step explanation:

The triangle has three sides and when added together they equal 38.

So if the second side is x, then the other sides are x-9 and x+2.

So x+x - 9 +x+2 = 38.

3x-7 = 38

3x = 45

x=15 so the second side is 15.

So the first side is x-9 = 15-9 = 6

The third side is x+2 = 15+2=17