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)
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