The cost c (in dollars) of building a house is related to the number k of carpenters used and the number e of electricians used by the formula† c = 15,000 + 50k2 + 60e2. if the cost of the house is fixed at $100,000, find dk/de e = 15

given that triangle abc is transformed two times to get triangle

a"b"c"

first abc is transformed in to a'b'c' as follows:

the coordinates of a are (1,-1) and transformed into a'(-1,1)

similarly b (4,-2) became b'(-4,2) and

c(7,-2) became c'(-7,2)

i.e. (x,y) becomes (-x,-y)

this is nothing but reflection about a point here origin.

thus first transformation is reflection on the origin.

next is exactly shifting 3 units down

source:

answer4 to the second power is 16

and 4 to the third power is 64,