Answer:
a) 3/4
b) 21/4
Explanation:
To find the scale factor from A to B take any side of B and divide it by the corresponding side of A
The ratio will be the same for all sides
We have
scale factor = 3/4
We see that the sides 9 and 12 are also in this ratio: 9/12 = 3/4
a) So scale factor from A to B is 3/4
b) w of shape B corresponds to the side with length 7 in shape A
The ratio of w to 7 must be equal to the scale factor
So w/7 = 3/4
w = 7 x 3/4
w = 21/4