The question is in the screenshot

b. -36/77

Step-by-step explanation:

As 0 < x < /2 => tan x > 0

As 0< y <  /2 => tan y > 0

We have the formula:

As tan x = 1/(cotx) =>

As tan x > 0 => tan x = 8/15

As tan y > 0 => tan y = 4/3

As tan (x-y)=  

the image of (6, 9) under a dilation is (4, 6). the scale factor is

452,489 to the nearest thousand is 452,000