Answer:
380 different ways
Step-by-step explanation:
We can solve this problem using a permutation formula, as the order in a group of two students matter.
So, for this problem, we have 20 students and want to form groups of 2, so we have a permutation of 20 choose 2:
P(20,2) = 20! / (20-2)! = 20! / 18! = 20 * 19 = 380 different ways
Another way to solve this problem is:
For the first student being chose, we have 20 students available, and for the second student, we have just 19, as one was already chose, so the number of ways to choose these two students is 20 * 19 = 380
You divide the double digit divisor into the dividend. If the dividend is a double digit number too then you add a decimal and a zero to the dividend
Its irrational because the square root of 127 is a decimal that goes on and on and cannot be represented as a fraction. So it is irrational.
Hope this helps.
First convert the 15 minutes to seconds
60 sec-= 1 minute
900 sec = 15 minutes
ratio and proportion
85 blinks/900 sec= 51 blinks/ x seconds
cross multiply
85x=45900
divide by 85
x= 540 seconds
hope this helps
Answer:
1/3
Step-by-step explanation:
plz mark brainlest
