Question

I forgot how to do most of this yet they gave it to me as hw ‍♀️

Answer 1

18.

-2(-9)+3

18+3

21

Explanation: -2(-9) When multiplying numbers that have both a negative sign, the answer is positive. Multiply normally.

19.

-6(-4)0

24(0)

0

Explanation: -6(-4) As I explained before, the answer would be positive.

24(0) Every number multiplied by 0 is 0.

20.

56+(-7)

49

Explanation: 56+(-7) Any problem like this is just basically going to be 56-7.

21.

-36+(-4)

-40

Explanation: -36+(-4) You are simply adding normally then adding the sign. This will only work if the signs are the same. (Signs are positive and negative.)

   

Answer 2

When using negatives for problems such as these, remember three things!

1.) Two "-" signs that are sitting next to each other will always change into a "+" sign.

    For example, 4 - (-5) = ? The two "-" signs in between the 4 and 5 become a positive number. It ALWAYS does!

2.) The bigger the number with the negative sign, then the answer will become negative in the end.

    For example, 7 - 10 = ? (OR -10 + 7 = ?) The biggest number with the negative sign is "10". Therefore the answer will become negative. When you place -10 on a number line (Number Line is from -10 to 0), add 7 to that -10. This means move 7 spaces to the right since it's a positive 7.

    -10, -9, -8, -7, -6, -5, -4, -3....You moved 7 spaces to the right. Now you see your answer is negative 3.

3.) If both numbers are negative and you're adding them, your answer will ALWAYS be negative.

    For example, -6 + -7 = ? (This is the same as -6 - 7) Look at these expressions as if you're adding them. 6 + 7 = 13. Now just add the negative sign. -6 - 7 = -13. That would be the answer.

Hope this helps!

Let me know if you need help solving the other problems. I'll gladly explain.