You can treat > like =, but you must remember it does not mean =.
12x > 5x - 20
7x > -20
-20/7 < x
So x must be larger than -20/7, but could be any where from -19/7 to positive infinity.
That's already a nice number because it can't be simplified any more, but if you want its decimal value, you can use the caculator on this site.
Well, for fractions, the numerators multiply and the denominators multiply.
So it would be:
(3x4)/(7x5)
=12/35
2 x pi x 4 / pi
=8pi/pi
=8
Let y = full barrel:
7y/10 - 243 = y/4
Multiply by each denominator to all numbers:
28y - 9720 = 10y
Rearrange:
18y = 9720
And solve:
y = 540 litres
sin90 + sin90
=1+1
=2
Pretend each side is a square and then add them up.
6*8 + 6*8 + 6*2 + 6*2 + 2*8 + 2*8
=152cm^2
Yes, it is.
(2y + 1) (y + 4)
greg's age = a
4a - 3 = 3a + 7
4a = 3a + 10
a = 10
Greg is ten years old.
(9.7 x 10^-9) x (7 x 10^12)
= 67.9 x 10^3
=6.79 x 10^4
