the half-life of a material is 4 hours. if the material starts with 300 mg, how much will remain after 20 hours?

9.375 mg will remain

hope that helped

if yes give me brainliest and if no draw my attention by hitting the comment section

no, the equation would be invalid since they are both not equal.

step-by-step explanation:

here you got

4y-6+4y 2-9

first, you would simplify the equation on the form.

4y-6+4y 2-9

then, move all the terms that contains a y to the left and all the other terms to the right.

+4y-4y+-9-6

finally, you will simplify the left and the right side of the equation.

y=-3