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padilas [110]
3 years ago
10

A radioactive isotope that was originally 275 grams has decayed to 150 grams. the equation shown can be used to calculate the nu

mber of years/T, it took for the decay to occur
150 + 275e ^-0.1386t
what is the approximate number of years it took for the isotope to decay for 275 grams to 150 grams?

A.0.1 years
B.0.4 years
C.1.9 years
D.3.9 years
E.4.4 years
Mathematics
2 answers:
agasfer [191]3 years ago
4 0

Answer: 4.4

Step-by-step explanation:

k0ka [10]3 years ago
3 0

Answer: 4.4 years

Step-by-step explanation:

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gladu [14]

Answer:

Just tried this on a calculator

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Step-by-step explanation:

5 0
2 years ago
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If QS bisects PQT, SQT=(8x- 25),PQT=(9x+34), and SQR=112, find each measure.
Goryan [66]

The values of the angles are; x = 12°, m∠PQS = 71°, m∠PQT = 142° and m∠TQR = 41°

<h3>What are the measure of the each angle?</h3>

The required angles; x, m∠PQS, m∠PQT, and m∠TQR

The given parameters are bisects ∠PQT

m∠SQT = (8·x - 25)°

m∠PQT = (9·x + 34)°

m∠SQR = 112°

We have;

m∠PQT = m∠SQT + m∠PQS (Angle addition postulate)

m∠SQT ≅ m∠PQS (Angles formed by angle bisector are congruent)

m∠SQT = m∠PQS  by Definition of congruency

m∠PQT = 2 × m∠SQT

Therefore;

(9·x + 34)° = 2 × (8·x - 25)° = (16·x - 50)°

Collecting like terms gives:

(34 + 50)° = 16·x - 9·x = 7·x

7·x = 84°

x = 84°/7 = 12°

x = 12°

m∠SQT = (8·x - 25)°

Therefore;

m∠SQT = (8 × 12 - 25)° = 71°

m∠SQT = 71°

m∠PQT = 2 × m∠SQT

∴ m∠PQT = 2 × 71° = 142°

m∠PQT = 142°

m∠PQS = m∠SQT (Angles formed by the same bisector )

∴ m∠PQS = m∠SQT = 71°

m∠PQS = 71°

m∠SQR = m∠SQT + m∠TQR (Angle addition postulate)

m∠SQT = 71°

∴  m∠SQR = 112° = 71° + m∠TQR

m∠TQR = 112° - 71° = 41°

m∠TQR = 41°

Learn more about angles here:

brainly.com/question/2882938

#SPJ1

4 0
1 year ago
find a positive angle less than one revolution around the unit circle that is co-terminal with the given angle -15pi/17
natta225 [31]
ANSWER
=\frac{19}{17} \pi

EXPLANATION

To find a positive angle that is coterminal with
-  \frac{15}{17}  \pi

We add multiples of 2π until we get a positive angle that is less than one revolution,


We add to obtain,


-  \frac{15}{17}  \pi + 2\pi


This simplifies to,

=  \frac{19}{17} \pi

This is the first positive angle that is coterminal with
-  \frac{15}{17}  \pi


and is less than one revolution.
7 0
3 years ago
Factor Completely: x2 − 7x + 6
Arte-miy333 [17]

Answer:

(x-6)(x-1)

Step-by-step explanation:

I am sure about this. You can use to solve it too.

5 0
3 years ago
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What is 3x+5x(5-5) please help <br><br> Add me on roblox dri_thebeat
Aleks [24]

Answer:

3x

Step-by-step explanation:

3x+5x(5-5)

3x+5x(0)

3x+0

4 0
3 years ago
Read 2 more answers
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