Answer:
f is a function because each student, or each element of the domain, corresponds to one element of range.
Step-by-step explanation:
function is each input has one output. input is domain, output is range
Answer:
d. 5
Step-by-step explanation:
I just learned how to do it just for this so please lmk if it's right or not :)
The value of k is -89
Explanation:
The given expression is 
We need to determine the output k, when the input t is -7
<u>Output k:</u>
The value of the output k can be determined by substituting the input
in the expression 
Thus, we have,

Multiplying the terms 10 and -7, we have,

Simplifying, we get,

Thus, the value of k is -89
Answer:
I think it's the second one.
Step-by-step explanation:
Hope dis helps :D
Use vertical pipes around the value.
Example:
abs(-4) = |-4| = 4