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

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.)

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, -3You 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.

false

step-by-step explanation: