1. Which situation represents a chemical change! A. burning a pile of twigs
B. boiling water in a teakettle
C. washing the mud off a dirty car

tbh i think all of them are but go with C

Step-by-step explanation:

burning and cooking are 2 examples of chemical change

Step-by-step explanation:

so I think it's is A. B can't be the answer because it's just boiling water since there's nothing in it, it's not really cooking

3. (5x + 1) - (-10x + 6)

simplify the answer choice. combine like terms. remember to distribute the negative to the terms inside the second parenthesis. also remember that two negatives = one positive, and one of each sign = negative.

- (-10x + 6) = + 10x - 6

simplify. combine like terms:

5x + 1 + 10x - 6

5x + 10x + 1 - 6

15x - 5

∴ it is your answer

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d

step-by-step explanation:

i used the pitagoras theoreme