Answer:
a = 9.849
b = 20.25
c = 491.03
Step-by-step explanation:
By using Pythagoras theorem in the right triangle BDC,
(Hypotenuse)² = (Leg 1)² + (Leg 2)²
BC² = BD² + DC²
a² = 9² + 4²
a = 
a = 
a = 9.8489
a ≈ 9.849 units
By mean proportional theorem,

AD × DC = BD²
b × 4 = 9²
b = 
b = 20.25 units
BY Pythagoras theorem in ΔADB,
AB² = AD² + BD²
c² = b² + 9²
c² = (20.25)² + 9²
c² = 410.0625 + 81
c = 491.0625
c = 491. 063 units
A = 7
b = -18
c = -52
Do you know what the Quadratic formula is to solve?
3.4+0.4+4.17=7.97 you just have to try different combinations of different numbers with the decimals.
10 year ×12 months=120 months
11150000÷120=
That is the answer, sorry I am going out can't find the answer
6.
I hope this helps, please Brainliest me, and have a great day! :D