The answer is four .......
<span>6+2(4v-5)=-2(7v-4)+7v
</span><span>6 + 8v - 10 = -14v + 8 +7v
8v - 4 = -7v + 8
15v = 12
v = 12/15
v = 4/5</span>
In general, nCr = n! / r! (n-r)!
Here, 7C3 = 7! / 3!(7-3)!
=7 x 6 x 5 x 4 x 3 x 2 x 1 /3 x 2 x 1 ( 4 x 3 x 2 x 1)
=7x6x5x4 / 4x3x2
=7x5x6x4 / 24
=35x24 / 24
=35
B) square root of 3
Repeating decimals are rational, surprisingly enough.
Fractions are rational.
The square root of 16 is 4, which is rational.
