The probability is defined as
.
The number of ways of selecting 2 girls from 12 girls is
.The number of ways of selecting 2 student from
students is
.
The required probability is ![\frac{66}{253} =\frac{6}{23} =0.261](https://tex.z-dn.net/?f=%20%5Cfrac%7B66%7D%7B253%7D%20%3D%5Cfrac%7B6%7D%7B23%7D%20%3D0.261%20)
Answer:
D
Step-by-step explanation:
1+3(6-3n)= -6-4n
1+18-9n= -6-4n
1+18+6= 9n-4n
25=5n
25/5=n
5=n
Solve for z:
42 = -7 (z - 3)
42 = -7 (z - 3) is equivalent to -7 (z - 3) = 42:
-7 (z - 3) = 42
Divide both sides of -7 (z - 3) = 42 by -7:
(-7 (z - 3))/(-7) = 42/(-7)
(-7)/(-7) = 1:
z - 3 = 42/(-7)
The gcd of 42 and -7 is 7, so 42/(-7) = (7×6)/(7 (-1)) = 7/7×6/(-1) = 6/(-1):
z - 3 = 6/(-1)
Multiply numerator and denominator of 6/(-1) by -1:
z - 3 = -6
Add 3 to both sides:
z + (3 - 3) = 3 - 6
3 - 3 = 0:
z = 3 - 6
3 - 6 = -3:
Answer: z = -3
Answer:
I believe it is 14 mm, hope i helped