Julie made rows of counters with a box of 100 counters. each row she made had one more counter than the row before it. the first row had 1 counter and the last row had 6. (a) how many counters did julie use? (b) how many were left in the box?

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:

-1

step-by-step explanation: