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vagabundo [1.1K]
3 years ago
12

18.A ________ change occurred when a metal changed Color because it reacted with another substance.

Mathematics
2 answers:
Sergio039 [100]3 years ago
7 0

The answer is a chemicl change.

poizon [28]3 years ago
5 0

A chemical change occured when a metal changed color because it reacted with another substance.

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What is the product mentally of (ab + 3)(ab - 3)
AleksAgata [21]

Answer:

ab² - 9

Step-by-step explanation:

Given in the question an expression

(ab + 3)(ab - 3)

To product mentally we will use polynomial identity called

Difference of squares

<h3>a² - b² = (a+b)(a-b) </h3>

here a = ab

        b = 3

(ab + 3)(ab - 3) = ab² - 3² = ab² - 9

3 0
3 years ago
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Solve the equation using the Properties of Equality: 15a = – 2
Lostsunrise [7]

Answer:

          2

a =  -  ------

         15

Step-by-step explanation:

15 a = -2  (divide 15 on each side)

15a           2

-----  =  - ------

15            15

          2

a =  -  ------

         15

3 0
3 years ago
Need help
shutvik [7]

Answer:

find the greatest common factor

in this case it would be 8, so she'd be able to make 8 packets maximum

Step-by-step explanation:

6 0
3 years ago
Describe the relationship between the values of the given digit. The 4s in 44,000
Juli2301 [7.4K]

Answer:

  one of them has a value that is ten times the value of the other one

Step-by-step explanation:

The most-significant 4 has a value of 40,000.

The least-significant 4 has a value of 4,000.

The most-significant 4 has a value that is 40,000/4,000 = 10 times that of the least-significant 4.

_____

The basis of a place-value number system is that the value of a digit is multiplied by the value of the base when the digit is placed one more place to the left in the number. That is, the digit in the 5th place to the left of the decimal point will have a value that is 10 times the value of the same digit in the 4th place to the left of the decimal point.

8 0
4 years ago
PLEASE HELP YOU WILL GIVE YOU POINTS!!!
Dafna1 [17]

Answer:

The Answer is the 2nd Table from the top

Step-by-step explanation:

Total of 30 men, 20 watched 10 didn't

Total of 80 participants, 45 Watched, 35 Didn't

The Female participants had to add up to fill in the bottom rows.

8 0
3 years ago
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