Answer:
two real solution
Step-by-step explanation:
x^2 + 10x − 25 = 0
we can solve this by finding out the value of x
lets assume the equation is a\times x^{2}+b\times x+c=0
x=-b\pm \sqrt{(b^{2}-4ac)}\div 2a
x=-10\pm\sqrt{100+4*25}\div2
x=-5\pm5\sqrt2
then we get both real value of x
so two real solution
Answer:
3.25 pounds
Step-by-step explanation:
First subtract the pounds of soil 2.2*3=6.6 so that takes away 6.6
22.85-6.6 =16.25
now divide 16.25 by 5
you get 3.25 so each bag was 3.25 pounds
and you multiply/add just to check
The standard deviation of a sample is proportional to 1/√N where N is the sample size. In this case we are decreasing N by half, so we can write:
1/√(N/2) = √2 / √N
If we say that our standard deviation is proportional to 1/√N, the difference that occurred from decreasing the sample size by half resulted in an increase in the standard deviation by a factor of √2.
Therefore, the standard deviation is multiplied by √2.
I think this is false. p +/- z*sqrt (pq/n) . Notice that the formula has sqrt of n.
