Please help Question 30

Letter n is not an expression.

Step-by-step explanation: Letter n is a term, constant, and variable. An expression is mainly like a math equation. Where the letter n, is just what I listed in the beginning.

n is not a constant

Step-by-step explanation:

n is a variable, since we do not know its value

It is a term in an expression

It can also be an expression since we have n items

it is not a constant since we do not know the value

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )