Answer:
3.9
Step-by-step explanation:
2p-9.9
=2(3)-9.9
=6-9.9
=-3.9
Factorize the numerator as a difference of squares:

Then if
, the
factors will cancel:

so the answer is B.
Answer:
20 stamps
Step-by-step explanation:
Let x be Muthu's original count
Let y be Sangeetha's original count
x = 4y
x - 12 = y + 12
y = x - 24
x = 4(x - 24)
x = 4x - 96
3x = 96
x = 32
so 32 - 12 = 20
Set up as a proportion
90/6 = 300/x
multiply 90x=6(300)
90x = 1800
divide both sides by 90
x=20