PROBABILITY
If you have three questions with three possible answers each, what is the probability of having at least 2 correct ones?
22%
What is electricity?
It is a form of energy caused by the movement of electric charges
What are the 3 different ways of solving systems of equations?
Substitution, Reduccion, Equating
In a scale of 2:3 what does the 2 mean?
The size of the drawing
What is a whole number?
It is a number without fractional, positive, negative or zero.
If there are 10 blue balls, 3 green and 6 white, what is the probability of getting the 3 green ones in a row (without replacement)
0.1%
What is intensity?
Intensity is the same as voltage divided by resistance
Solve this system:
2x + y = 5
x - y = 1
X=2
Y=1
In a scale of 5:9 what does the 9 mean?
The size of the real object
What does it mean for a number to be rational?
Which can be expressed as the quotient of two integers, with a denominator other than zero
AUB means that
It can happen A or B
If resistance is high …… is low
Intensity
How do you apply the substitution method?
It consists of clearing a variable in one equation and replacing it in the other to find the values that satisfy both.
What type of scale is it a scale of 6:4?
Enlarged scale
Which of theese numbers is negative?
-|-8|+10 -(-5)-9 -3^2 (-3)^2
-(-5)-9
-3^2
In a bag there are numbers from 1 to 10, what is the probability that you get three numbers in a row (1, 2, 3/2,3,4...)
1/15 or 6.67%
What is voltage measured in?
Volts
How do you apply the reduction method?
It consists on adding or subtracting the equations to eliminate a variable and thus solve the system more easily.
What type of scale is it 3:3?
Full scale
Give an example of an irrational number
Pi, square root of 2, Fi…
What is the probability that in a penalty shootout, a goalkeeper will guess 3 out of 5 shots, assuming that each shot has an independent probability of being stopped of 30%?
13.23%
What is the difference in the energy between parallel and series circuit?
In the series circuit the energy is divided between the elements, but in the parallel one the voltage is the same in every element
Solve this system:
(2x/3) - (5y/4) = 7/6
(3x/5) + (7y/8) = 9/10
X=103/64
Y=-3/40
Ina scale of 50:1, knowing that the reality is 16.7cm, what is the size of the drawing?
835cm
What is the square root of 17689?
133