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Sladkaya [172]
3 years ago
12

Can anybody help me plz I really need help !!!!

Mathematics
1 answer:
kipiarov [429]3 years ago
4 0

Answer:

A) 75%

B) 76

Step-by-step explanation:

A) 39/52=0.75=75%

B)80x0.95=76

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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
The sales tax in the city of Taxemalot is 8.1%. What is the growth factor for any item purchased at your local Tarmart? a.8.1 c.
Rama09 [41]
I have to go to the store and get some rest and feel better soon and that is the only way I can get a ride to the airport on Friday and I will be there at the same time I don't have to go to the store and get some rest and feel better soon and that is the only way to get the attention of the day at the office and I will be there at the same time
7 0
4 years ago
The last answer is D. 15 meters
Lapatulllka [165]
5^2 +12^2= diagonal^2
25+144=d^2
169= d^2
D= 13
4 0
3 years ago
Ten points plus brainlist whats<br> -3 divide (-2/5)
Taya2010 [7]

Answer: 7.5

Step-by-step explanation: -2/5= -0.4 so -3/-0.4=7.5

5 0
4 years ago
BrainiestI WILL GIVE BRAINLIEST look at the right angled triangle abc
marissa [1.9K]

Answer:

x = 90°

y = 40°

z = 40°

Explanation (Concepts) :

A straight line has total 180° angle. A square has 4 sides of each 90° angle. A triangle is build up of 180° interior angle.

Workouts:

z + 90° + 50° = 180°

z = 180° - 90° - 50°

z = 40°

=================

x + 90° = 180°

x = 180° - 90°

x = 90°

==================

50° + 90° + y = 180°

y = 180° - 90° - 50°

y = 40°

5 0
2 years ago
Read 2 more answers
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