Interest gained for a particular period equals to Money invested (kept) in Savings account for that period <em>multiplied by </em>Interest accrued on this money.
Therefore, Accrued interest i(x) = h(x) * s(x) = 200 * [ (1.05)x - 1 ],
where x is the number of years for which money is invested.
So, new function i(x) = (210)x - 200 .
The best thing to do is to find the cost of one sweet, and to do this, divide 42 by 7.
42/7= 6
Therefore, one sweet costs 6p.
To find the cost of 8 sweets, you've got to multiply 6 by 8, and this gives you 54p.
Therefore, 8 sweets cost 54p
Hope this helps :)
According to the trigonometric relations in a right triangle, we have:
