-6x^4-7x^2+5x-10. hope this helps ! :)
A decagram is 10 grams, so first lets convert the decagrams to grams and then after we'll change to kilograms.
If 1 decagram equals 10 grams, then 2500 decagrams is equal to:
2500*10 = 25000 grams
Now, 1 kilogram equals 1000 grams so 25000 grams equals:
25000/1000 = 25 kg
therefore, 2500 decagrams equals 25 kg
C = pi * r ^squared
r = is radius
square the radius, multiple by r
or
2 x pi x r
Check the picture below.
you can pretty much just count the units off the grid.
the perimeter is the length of all sides summed up.