Equations
What is the equation of a circle ?
X2 + Y2 = r2
A bag contains 4 pink, 5 purple and 6 blue marbles. Three marbles are drawn at random from the bag. What would the probability of them all being red be ?
2/91
8
X2 + 6x=14
X = -3 +/- square root 23
Write the equation of a circle with center of (-3,4) and a radius of 7.
(X+3)+(Y-4)2 = 49
What is the slope-intercept form?
y=mx+b
If two letters are taken at random from the word APPLE, what is the probability that none of the letters would be vowels?
6/25
In how many ways can the letters of the word ‘LEADER’ be arranged?
360
2x2 - 7x =5
X= 7+/- square root 89 /4
Write the equation of a circle with a center of (-9,6) and a radius of 13.
(X+9)2 + (Y-6)2 = 169
What is the distance formula?
d=square root(X2-X1) + (Y2-Y1)
A coin is thrown 3 times. What is the probability that at least one time it will land on tails?
7/8
How many possible two digit numbers can be generated using the numbers 1,2,3,4 without repeating?
12
4x2 + 5 = -6x
X = -3/4 +/- square root 11/4 i
Write the equation of a circle with a center of (-9,6) and a radius of 13.
(X+9)2 + (Y-6)2=169
What is the midpoint formula?
(X1+X2/2,Y2-Y1/2)
A dice is thrown twice. What is the probability of getting a sum of nine?
1/9
You are given the letters A,B,E and L. How many different words can be made with these four letters?
24
5x2+6x+1=0
X= -0.2 or x=-1
Find the equation of the circle.
X2 + Y2 - 10x + 8y=23
(X-5)2 +(Y+4)2 = 64
What is the quadratic formula ?
X=-b+square root(b2-4ac)/2a
There are three hotels in a city. If 2 men check into the hotels on the same day then what is the probability that both men check into separate hotels?
2/3
Ana has 8 red marbles and 8 purple marbles. How many ways can she arrange marbles in a row so that the colors alternate?
2 x (8!)2
1/6x2 + 4/3x - 2/3=0
X=-4 +2 square root 5
Find the equation of the circle.
X2+ Y2 + 2x + 4y=9
(X+1)2 + (Y + 2)2 = 14