Answer:
1
Step-by-step explanation:
Answer:
1/5
Step-by-step explanation:
This question needs more info
Answer:
7
Step-by-step explanation:
by similarity of traingles Δxuw and Δxyz
xu/xy = uw/yz
given xu+uy=xy and xu=uy
2(xu)=xy
xy=2(uy)
=>5x+4=2(4x-1)
=>5x+4=8x-2
=>3x=6
=>x=2
=>given length of uw=>4x-1=4(2)-1=7
Well per book there are 4 spots it could be in. So the ratio of books per spots is 1:4, you multiply this by 4 because of four books and her 4:16, making the amount of ways to set them being 16.