Half life can be used to solve for the amount (A) of a substance left after t time by using the following equation: A=A0⋅(12)th
If the half life of a substance is 4 weeks, how long will it take for 400 mg of this substance to decay to 25 mg?

don't know what that says sorry i can't you

step-by-step explanation:

idk what it says

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)