A would be the correct answer.
The numbers 3,4,5 are a Pythagorean Triple. This means they can be put in the form a^2 + b^2 = c^ where a=3, b=4 and c=5.
The ones with brackets in are functions, and the other ones are weekly growth rate.
After using substitution, x= -3/2 and y=-5/2 should be your answer.
The apple is cut into 10 pieces so each piece is 1/10 of the apple. 1/10=.1; .8=8/10 so 8 pieces are eaten. 2 pieces are left which is 2/10 of the apple which simplifies to 1/5 because 2 and 10 are both divisible by 2. 2 divided by itself is 1 and 10 divided by 2 is 5. So the amount of the apple left in simplest form of a fraction is 1/5.
