Answer:
$15
Step-by-step explanation:
Your friend spent on his lunch you simply only spent on yours.
Answer:

Step-by-step explanation:
To evaluate or simplify expressions with exponents, we use exponent rules.
1. An exponent is only a short cut for multiplication. It simplifies how we write the expression.
2. When we multiply terms with the same bases, we add exponents.
3. When we divide terms with the same bases, we subtract exponents.
4. When we have a base to the exponent of 0, it is 1.
5. A negative exponent creates a fraction.
6. When we raise an exponent to an exponent, we multiply exponents.
7. When we have exponents with parenthesis, we apply it to everything in the parenthesis.
We will use these rules to simplify.

Answer:
see below
Step-by-step explanation:
5(4 + 8) =
Distribute
5*4 + 5*8
20 + 40
60

At the respective max and min values
Answer:
=> Apply law of cosine

=> input value

=> simplify

=> calulcation

=> apply rule: Distance must be greater than 0
which is about 14.51828