Define a variable in terms of another

One example is y = 2*x

The variable y is defined to be 2 times x

x and y are placeholders for a number. If you replace x with something like 9, then y = 2*x = 2*9 = 18. So x = 9 leads to y = 18.

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8  

on monday rodney ate 1/4th of the sandwich = 3/12

on tuesday he ate 1/3rd of the sandwich = 4/12

therefore in total he has eaten = 3/12 + 4/12 = 7/12

thus we can say that he has eaten 7/12 of the sandwich on monday and tuesday alltogether.

happy to

pls mark as brainliest.