Aresearcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. what is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code? a. 4
b. 5
c. 6
d. 7
e. 8

B. 5

Step-by-step explanation:

The code can either be Single letters or 2 letter in alphabetical order

single letter coder are

A

B

C

D

The two letter code are

AB

AC

AD

BA

BC

BD

CD

That is, a total possibility of 10 code which means 4 is not going to work

When E is added then we have AE, BE and the rest . The possibility will be more than 12 so if we have 5 letter then we will have more than enough which means 5 is the answer

c

step-by-step explanation:

i think because what else can be a sample of every member

step-by-step explanation:

f(x)=2x^2 -1 

translation is a function transformation that transform the function in a way of translating. by translating the function its graph is moved  up an down. moving the function f(x) 2 units to the left will be the new function g(x) with the equation: g(x)=f(x+2)=2(x+2)^2 -1