How can you use a number line to show that 18 + ( -18) = 0? plz explain your answer.
a. begin at 18 and move 18 units to the right .
b. begin at 18 and move 18 units to the left.
c. begin at -18 and move 18 units to the left.
d. begin at 0, move 18 units to the right, then move 18 units to the right again.

The correct answer is B.

Before you start using the number line, you must always keep in mind that:

– and – = +

+ and – = –

+ and + = +

– and + = –

To remember all this you'd also have to keep in mind that all like-terms which are the (– and –) and (+ and +) are both positive or (+). Also, the terms which are not alike such as (– and +) and (+ and –) are negative or (–).

In this problem, we have 2 signs which are (+ and –). As I said above, these terms that are not alike are (–).

On the number line since they're negative, we have to move to the left or subtract. For the opposite of that, we'll have to move to the right or add.

18 + (-18)=0.

To prove this, REMOVE THE BRACKETS and calculate as usual.

18 + - 18 = 0

In this case, we have to SUBTRACT or MOVE TO THE LEFT ON THE NUMBER LINE.

So, the answer is 0 after we subtracted both terms. We do this by:

18 - 18 = 0.

So, we have to:

BEGIN WITH 18 AND MOVE 18 UNITS TO THE LEFT.

Therefore, the answer is B.

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64