Answer:
8.9
Step-by-step explanation:
1. DE:BC=AD:AB
2. AD=AB+BD, but according to the conditions AB=5, then
AD=5+BD.
3. after the substitution DE=16; BC=9; AB=5 and AD=5+BD into the formula:
16:9=(5+BD):5;

BD=80/9 - 5≈3.9.
4. if AD=AB+BD, then AD=5+3,9=8,9
Answer:
7
Step-by-step explanation:
7
So i believe you need to round the whole number, if so than 8 * 3 = 24 and 20 * 3 = 60
Answer:
9 square root of 2 or 12.73