Let the two numbers be x and y, then,
xy = -12 . . . (1)
x + y = -10 . . . (2)
From (2), x = -10 - y . . . (3)
Putting (3) into (1), gives
(-10 - y)y = -12
-10y - y^2 = -12
y^2 + 10y - 12 = 0
Therefore, the two numbers are
and
Answer:
B
Step-by-step explanation:
Assume both their ages are 
One is 3 years older than the other, and the sum of their ages add up to 19
Answer:
a. 205320
b. 34220
c. 60! / (35)! (25)! + 60!/ (40)!(20)! + 60!/ (45)! (15)!
Step-by-step explanation:
a) The number of ways to dustribute exams among the TA's is:
n / (n - r)!
n= number of things to choose from
r= Choosing r number
60P3= 60! / (60 - 3)!
(60)(59)(58)(57)! / (57)!
=205320
B) The number of ways to dustribute the exams among the TA's is:
n! /(n - r)! r!
60C3= 60! /(60 - 3)! 3!
= 60!/ 57! 3!
= 60 × 59 × 58 / 3 × 2 × 1
= 34220
C) The required number of ways is:
60C25 + 60C20 + 60C15
= 60! / (35)! (25)! + 60!/ (40)!(20)! + 60!/ (45)! (15)!
Answer:
a=4
Step-by-step explanation:
100/a=25
100/25 =a
a=4
Answer:
a) 5r +3 + 2(r+9) = 7r + 21
b) 2 (4w - 5) - 2 (w - 7) = 6w + 4
Step-by-step explanation:
a) 5r +3 + 2(r+9) = 5r +3 + 2r +18 = 7r + 21
b) 2 (4w - 5) - 2 (w - 7) = 8w -10 -2w +14 = 6w + 4
