Answer:
The rock is 3.75 billion years ago.
Explanation:
Given that:
Half life = 1.25 billion years
1 billion years = 10⁹ years
So,
Half life = 1.25 × 10⁹ years

Where, k is rate constant
So,


The rate constant, k = 5.5452 × 10⁻¹⁰ years⁻¹
Initial amount [A₀] = 80 micrograms
Final amount
= 10 micrograms
Using integrated rate law for first order kinetics as:
![[A_t]=[A_0]e^{-kt}](https://tex.z-dn.net/?f=%5BA_t%5D%3D%5BA_0%5De%5E%7B-kt%7D)
So,





So,
<u>The rock is 3.75 billion years ago.</u>
<span>Friar Laurence's special skill is in making medicines and potions from herbs.
In Romeo and Juliet, Friar Laurence is depicted as a well-liked and respectable monk that often give Romeo Life advice.
His skill is first revealed in </span><span> Act 2, Scene 3 when he is mixing various types of weeds and flowers to make a potion.</span>
The correct answer is establishing relationships.
Eye contact or gazing at someone is a non-verbal communication technique that has a few different meanings. One of these meanings is trying to establish a connection and expressing interest in another person. In this instance, where Sandra notices someone <span>at a coffee shop she would like to approach and meet, by making eye contact with them she is trying to non-verbally express that she is interested in forming a connection with them. </span>
Answer:
D
Explanation:
Marbury v. Madison was a court case that resided with William Marbury being appointed by John Adams, but during the process of his commission, Thomas Jefferson became president, and he and Secretary of State James Madison, added new courts and new judges. William Marbury's commission was not delivered to him, therefore petitioning to the Supreme Court for a writ of mandamus compelling the delivery of his commission.
The Court found Madison's refusal to deliver commissions was illegal but did not grant Marbury a writ of mandamus. Instead, the court held that Marbury did not have the right, under the Judiciary Act of 1789, to claim to the Supreme Court that Madison's act was unconstitutional.
The court knew that a writ of mandamus would be the proper way to fix the situation, but concluded that the court couldn't issue it. Therefore making it clear that Congress did not have the power to modify the Constitution through regular legislation.
Doing this, the Supreme Court established the principle in judicial review and expanded the powers by having the power to declare a law unconstitutional.
Hope that helps your question.