Answer:

Step-by-step explanation:
For each right-angled triangle:

Because 
we have an equation

multiplying both sides by x, we get 
dividing both sides by 0.4 and 
using calculator, we divide 12 by 0.4
and finally x=30
Answer:
soft sounds are better because the energy in the waves hitting your eardrum and if there is too much energy it could damage your ear.
Step-by-step explanation:
Answer: 20 months
Step-by-step explanation:
x months times y for views over 1 month = 9000000 views
3 x 150000(views per video) = 450000
9000000/450000= 20 months
Answer:
B. 
Step-by-step explanation:
The hypotenuse leg theorem (HL) requires the proof that the hypotenuse and the corresponding leg of the triangles to be equal in length. From the diagram, it can be found that
is a common (shared) side of both triangles, so the additional fact needed is for the hypotenuses to be the same length.
∴
is the additional fact needed to prove 
Hope this helps :)
The answer is 6t^2+2.5x^2-0.5t-5.4