Hello!
To solve this equation, we will need to use PEMDAS (parentheses, then exponents, then multiplication/division, then addition/subtraction).
7(3) + (-9) x (-4) =
21 + (-9) x (-4) =
21 + 36 =
57
I hope this helps you! Have a lovely day!
- Mal
Answer:

Step-by-step explanation:
Let
x ----> the average depth of the resulting layers of ash and rock
we know that
To find out the average depth, divide the cubic kilometers of molten rock by the area where all the ejected material fell.
so

Convert to meters
Remember that

so

Convert to mixed number

Answer:
178
Step-by-step explanation:
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Answer: Answer #1 in top left corner
Explanation:
Only have 15 sites represented
I hope this helped!
<!> Brainliest is appreciated! <!>
- Zack Slocum
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16 classes have 25 students each which EQUALS a total of 400 students and 3 classes which each have 100 students each which EQUALS a total of 300 and 1 class has a total of 300 students and the total number of students is 1000