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Let S be a semigroup. Prove that S is a group if and only if the following conditions hold: 1. S has a left identity—there exists an element e ∈ S such that ea = a for all a ∈ S; 2. each element of S has
asked
Sep 24, 2020
Mathematics
college
1
answer
4
votes
159k
views
A population in which the frequency of alleles remains the same over generations is said to be in genetic equilibrium. Describe one mechanism by which a populations' genetic equilibrium can be disrupted
asked
Jun 18, 2020
Biology
college
2
answers
1
vote
180k
views
Which president depicted on mount rushmore is wearing glasses
asked
Mar 17, 2020
History
high-school
2
answers
1
vote
219k
views
The action potential causes neurotransmitters to be released into the __________. A. myelin sheath B. axon C. synapse D. synaptic vesicle E. synaptic knob (btw the answer isn't D or E, i tried both, there
asked
Dec 6, 2019
Advanced Placement (AP)
middle-school
1
answer
4
votes
59.5k
views
Michelle draws a card from a standard deck of 52 cards. She replaces the card and draws a second card. What is the probability that she draws a red card and then a black card A) 1/16 B)1/26 C)1/4 D)1/52
asked
Aug 27, 2019
Mathematics
high-school
1
answer
3
votes
148k
views
Boards of pharmacy regulate pharmacists
asked
May 3, 2019
Biology
middle-school
2
answers
0
votes
141k
views
The information age was when people first began using written communication for:
asked
Feb 27, 2019
Social Studies
high-school
2
answers
0
votes
234k
views
Looking for reasons and connections requires asking the right questions. A.asking the right questions. B.detective work. C.looking at all possibilities. D.critical thinking.
asked
Oct 8, 2018
English
middle-school
1
answer
2
votes
142k
views
Find the value of x.
asked
Sep 20, 2018
Mathematics
high-school
1
answer
0
votes
36.8k
views
Clark made four of his truck payments late and was fined four late fees. The total change to his savings from late fees wad -$40. How much was one late fee?
asked
Aug 24, 2018
Mathematics
college
1
answer
4
votes
65.5k
views
What is the reduced and simplified value of expression?
asked
Aug 17, 2018
Mathematics
college
2
answers
4
votes
201k
views
How did the pharaoh come into power (become rulers)?
asked
Apr 14, 2018
English
middle-school
1
answer
3
votes
101k
views
During transcription from DNA to RNA which base occurs only in RNA
asked
Feb 25, 2018
Biology
high-school
2
answers
0
votes
33.0k
views
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