how should I solve b? i already solved a and got 1:2

the dimensions of the photo irl is 1.6in by 1.875in (the photo was on my textbook, so it was accessible to measure)

Guest Jul 21, 2017

#1**+1 **

Note that we can find the scale factor thusly :

(3 +1/4) / `1.6 =

(13 / 4 ) / ( 16 / 10) =

(13 / 4) / ( 8 / 5 ) =

(13 / 4) * ( 5 / 8 ) =

(65 / 32) = 2.03125

So...."x " = 1.875 * 2.03125 = 3.80859375

Proof.....the area of the enlargement is 3.80859375 * 3.25 = 12.3779296875 in^ 2

And rhe area of the smaller picture times the square of the scale factor should equal this

So .... 1.6 * `1.875 * 2.03125 ^2 = 12.3779296875 in^2

CPhill
Jul 21, 2017