Need help with this problem

  31.8°

Step-by-step explanation:

The mnemonic SOH CAH TOA reminds you of the relevant trig relation:

  Sin = Opposite/Hypotenuse

Here, that means ...

  sin(A) = BC/AC

  sin(x°) = 39/74

The arcsine function is used to find the angle when its sine is known.

  x° = arcsin(39/74) ≈ 31.8°

__

Additional comment

You may be more familiar with the notation ...

This is how the arcsin (inverse sine) function is identified on most calculators.

b) the dogs need to shift their focus to human scent.

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐