Get the app Photomath to do basic math like this, otherwise:
First flip the reciprocal - (-5/8) changes to (8/5).
Next reduce, the 5's change to 1, and the 12 and 8 leave it as...
(1/3) x 2 =
(2/3) As your answer
Answer: 1. y=4
Step-by-step explanation:
for 1. if x = -2 then the problem becomes -2(y) = -8 and -2 x 4 = -8
It is an irrational number
There are two solutions for this problem. It depends if order matters or not. As asked in the problem, we have to show both solutions.
The first solution is for the condition that order does not matter. This is a combination problem:
nCr = n!/r!(n-r)!
where n=10 because there are 10 total students, and r=2 because you choose 2 students at a time
nCr = 10!/2!(10-2)! = 45 ways
The second solution is for the condition that order matters. This is a permutation problem.
nPr = n!/(n-r)! = 10!/(10-2)! = 90 ways
