Strontium-90 has a half-life of 28 days. Find the mass (in mg) remaining after 20 days. (Round your answer to one decimal place.) mg

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

h= 12 inches

step-by-step explanation:

the answer is d

step-by-step explanation:

you can also use mathway to get you answer + steps