Answer:
8190 ways
Step-by-step explanation:
Given
Selection
Required
Number of ways of selection
4 students can be selected from 15 students in:
Similarly.
5 teachers can be selected from 6 teachers in:
So, the required number of selection is:
Apply combination formula:
44 because it goes into both of the numbers twice without going over
8x^2+6x^2+4x=138 combine like terms on left side
14x^2+4x=138 since the number of seats in the from row is just 4x, subtract 14x^2 from both sides
4x=138-14x^2 that would be the general solution, if you wanted the actual number you would have to solve for x and then multiply that value by 4 to know what "4x" is...
14x^2+4x-138=0
14x^2-42x+46x-138=0
14x(x-3)+46(x-3)=0
(14x+46)(x-3)=0
2(7x+23)(x-3)=0, since x>0
x=3 and thus
4x=12 seats
So there are 12 seats in the front row addition.
Answer:
Richhhh!!! Thanks for the points!!
Step-by-step explanation:
