each side of the pentagon is multiplied by 5/3 to get the length of each new side, so the perimeter is multiplied by 5/3 to get the new perimeter.
new perimeter = (scale factor)*(old perimeter)
new perimeter = (5/3)*(old perimeter)
new perimeter = (5/3)*(21)
new perimeter = (5/3)*(21/1)
new perimeter = (5*21)/(3*1)
new perimeter = 105/3
new perimeter = 35 inches
the dog will eat 300 grams
because there is no graph, i will just tell you how many years it should take, and you can probably figure it out from there. to start, let's [get out a calculator] find out what 2% of 250 is. this is 5, so we can add 5. notice that adding 5 to the number does not change 2% of it by much, only by 5/50 or 0.1. so, we can keep adding until we get above 282, which should take 285 minus 250 over 5 times, or 7. so, the answer is 7 years. you can [get out a calculator] and find out that it is indeed 7 years.