Situation: Find t
Round
A 42 gram sample of a substance that's
used to treat thyroid disorders
has a k-
value of 0.124.
-kt
N = Noe
No = initial mass (at time t = 0)
N = mass at time t
k = a positive constant that depends on
the substance itself and on the units
used to measure time

t=time, in days

Find the substance’s half-life, in days. Around your answer to the nearest tenth.

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt

28

step-by-step explanation:

because that's the answer

b, i believe, but not sure.