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Hoochie [10]
3 years ago
9

Geometry help please :(

Mathematics
1 answer:
jekas [21]3 years ago
8 0

Answer:

you need to show da photo

Step-by-step explanation:

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Strontium-90 has a half-life of 28.8 years. If you start with a 300-gram sample of strontium-90,
Kazeer [188]

Answer:  2.66 × 10⁻¹³

<u>Step-by-step explanation:</u>

First, use the decay formula   A=A_oe^{kt}   where

  • A is the final amount (amount left)
  • A₀ is the initial amount (amount you started with)
  • k is the rate of decay (you need to solve for this)
  • t is the time

Given:

  • A = 1/2(300) = 150
  • A₀ = 300
  • k = unknown
  • t = 28.8

150=300e^{28.8k}\\\\0.5=e^{28.8k}\\\\ln(0.5)=ln(e^{28.8k})\\\\ln(0.5)=28.8k\\\\\\\dfrac{ln(0.5)}{28.8}=k\\\\\\\large\boxed{-0.0240676=k}\\

Next, input the k-value and the new t-value to solve for A.

  • A = unknown
  • A₀ = 300
  • k = -0.0240676
  • t = 1440

A=300e^{1440(-.0240676)}\\\\\large\boxed{A=2.66\times 10^{-13}}\\

5 0
4 years ago
a building with a height of 32m casts a shadow that is 20m long. a person standing casts a shadow that is 1.2 m long how tall is
wlad13 [49]
Most of the information's required for solving the question is already given in the question.
Height of the building that casts a shadow of 20 m = 32 m
Then
Height of the man that casts a shadow of 1.2 m = (32/20) * 1.2 meter
                                                                             = 3.2 * 1.2 meter
                                                                             = 3.84 meter
So the actual height of the person casting a shadow of 1.2 meter is 3.84 meters. I hope that the procedure used for solving the problem is easy enough for you to understand. You can definitely use this method in future for solving problems of similar type without requiring any additional help from outside.

6 0
4 years ago
In each equation below, the letter x stands for an unkn
Sergeeva-Olga [200]

Answer:

x=35

Step-by-step explanation:

Given the following question:

\frac{x}{5} =7

When x is the numerator of the fraction you multiply each side by the denominator in order to isolate the variable.

\frac{x}{5} =7
\frac{5x}{5} =x
7\times5=35
x=35

Hope this helps.

8 0
2 years ago
Read 2 more answers
2.2
Ludmilka [50]

Answer:

R180

Step-by-step explanation:

Adjusted income = (original pocket money x new ratio) / old ratio

( 6 x $150) / 5 = $180

4 0
3 years ago
Solve the system of linear equations.(Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.
NARA [144]

Answer:

No solution!

Step-by-step explanation:

Kindly see the attached file for processed solution

3 0
3 years ago
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