Replace each verbal statement using variable expressions:

A:	if ten times a number is reduced by the same number, the result must be nime times the number
B:	increasing a number by itself and 5 is the same as doubling the number and adding 5
C:	the perimeter P of a rectangle is twice the length A of a side added to twice the lenght B of an adjacent side
D:	the profit P is the difference betweeen the revenue R and the total costs C
E:	the area A of a rhombus equals one-half the product of ist diagonals D1 and D2