Finding how much fence Angela needs to put in garden can be found by finding the perimeter of the walls that are not blocked by anything. For example, the house is blocking one side of the garden.
We can write this expression as: 2x + 2x + x
After solving we get 5x.
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168
So you take the 144 divide 12(the dozen) so we could find how much 1 cost, it was 12. You added 2 more books so we add(12x2)+(144). That equals to 168
Hope this helps!
So in 6 months (1/2yr) you earned $15.75 interest, if we double that we find the total interest you would gain for that year, 15.75x2= $31.5 total interest for that year.
To find the annual rate divide the interest gained by the amount deposited, 31.5/500 = 0.063% p.a.
6x3.14 = 18.84. That should be the answer