How many solutions does the system have? 4x−10y=−20 6x−15y=−30

idk wbu

step-by-step explanation:

moderators are

      2

  2 is to go somewhat to the top right of a because it is squared    

v= a h/3

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

source: