Answer:
Step-by-step explanation:
To solve this problem we are going to set Python as the language.
books = ["a", "b", "c", ... , "z"]
selection = list(3) #here we set a list of dimension 3 as 3 are supposed to be selected
for book in books: #here we parse into the books list
If book in selection: continue #in order to obtain different books, if the book #already in selection list, then we jump
selection.append(random.choice(books)) #if not, we add the book to #selection
print(selection)
here's the solution,
let the length of shorter peice = x
then the lenght of longer peice = 6x + 8
now, we know that the sum of length of peices measures 99 feet,
So,
=》x + 6x + 8 = 99
=》7x = 91
=》x = 13
shorter piece length = 13 feet
longer peice length = 13 × 6 + 8 = 78 + 8 = 86 feet
P(TTTTT)=P(T)*P(T)*(PT)*P(T)*P(T)
P(TTTTT)=(P(T))^5
P(T)=1/2 so
P(TTTTT)=(1/2)^5
P(TTTTT)=1/32
P(TTTTT)=3.125%
Answer:
a+b=180
13y+31y+4=180
44y=176
y=4
r=s
130x-160=30x+40
x=2
b=128
a=52
s=100
r=100
hopefully its correct (✿^‿^)
Answer: Neutrons
Step-by-step explanation:
Isotopes are atoms of the same element, but whose nuclei have a different number of neutrons, but same number of protons and electrons. Protons and neutrons are found inside the nucleus while electorns are outside and around the it.
<u>Since the amount of neutrons is different, isotopes have a different mass number compared with the element</u> (remember mass number is the sum of protons and neutrons). However, they have the same atomic number, because they have same amount of protons and electrons, and that also indicates they are electrically neutral.
There can be many different isotopes of the same element because they can have different number of neutrons. So this means most chemical elements have more than one isotope.
Some elements have natural but unstable isotopes, for example uranium, whose isotopes can decay into other more stable isotopes. Through this process, they emit radiation. They can be used for estimating the age of natural samples, such as rocks and organic matter because the average rate of decay of a given isotope is known, relative to those that have already decayed.