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zvonat [6]
3 years ago
12

radioactive iodine is used to determine the health of the thyroid gland it decays according to the equation y=ae^-0.0856t where

t is in days find one fourth life of this substance
Mathematics
1 answer:
KengaRu [80]3 years ago
5 0

Answer:

16.19 days.

Step-by-step explanation:

The radioactive iodine is used to determine the health of the thyroid gland and it decays according to the equation y = a(e)^{- 0.0856t} where t is in days and a is the initial amount and y is the final amount after decay for t days.

We have to find a one-fourth life of this substance.

So, \frac{a}{4} = a(e)^{- 0.0856t}

⇒ \frac{1}{4} = 0.25 = e^{- 0.0856t}

Now, taking ln both sides we get,

ln (0.25) = - 0.0856t ln e {Since, \ln a^{b} = b \ln a}

So, t = 16.19 days. (Answer)

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Would it be X=Y^3-2 bc I think you flip the x and y
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Brainliest and 50 points! Data picture is added below
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Answer/Step-by-step explanation:

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3 years ago
I need help with Geometry
ehidna [41]

Answer:

We conclude that segment QR is the shortest.

Hence, option B is true.

Step-by-step explanation:

First, we need to determine the missing angle m∠R

Given the triangle Δ∠PQR

m∠P = 48°

m∠Q = 83°

m∠R = ?

We know the sum of angles of a triangle is 180°.

m∠P+m∠Q+m∠R = 180°

48°+83°+m∠R=180°

m∠R = 180° - 48° - 83°

m∠R = 49°

Thus, the value of m∠R = 49°

We know that the longest side in a triangle is opposite the largest angle, and the shortest side is opposite the smallest angle.

Here,

m∠P = 48° is the shortest angle.

As the side QR segment is opposite the smallest angle i.e. m∠P = 48°

Therefore, we conclude that segment QR is the shortest.

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5 0
3 years ago
a carpenter has three sheets of plywood that are each 6.85 feet long. a 3.4-foot piece is cut from one sheet 0.5-foot piece is c
STatiana [176]

Answer:

16.65 feet

Step-by-step explanation:

Okay, we have three boards that are each 6.85 feet long. If we cut 3.4 feet off one board, that board has:

6.85

−

3.4

=

3.45

feet left

If we cut off 0.5 feet off another board, that board has:

6.85

−

0.5

=

6.35

feet left

So, if we take our three new boards, the total length of plywood left is:

6.85

+

3.45

+

6.35

=

16.65

feet

Hope this helps!

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just olya [345]

Answer:

Length is 30ft, area is 600ft squared

Step-by-step explanation:

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