Anita saves 20% of her salary for retirement. This year her salary was $3000 more than in the previous year, and she saved $4000. What was her salary last year? A) $17000
B) $18000
C) $20000

is should be y = 5x

step-by-step explanation:

correct me if im wrong

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.