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hoa [83]
4 years ago
13

Define pemdas just a little review.

Mathematics
2 answers:
Papessa [141]4 years ago
5 0

Answer:

Step-by-step explanation: PEMDAS is an easy way to remember the order of operations. In the image provided, I attached what the letters actually mean so you can take a look at that.

I'll show an example of a problem using PEMDAS.

8 + 2 × 3

The first thing you need to know about the order of operations is that multiplication and division always come before addition and subtraction.

So in this problem, we will multiply before we add.

Since 2 × 3 is 6, our next step will read 8 + 6 which simplifies to 14.

kkurt [141]4 years ago
3 0
Please (Parentheses)
Excuse (Exponents)
My (Multiplication)
Dear (Divide) 
Aunt (Add)
Sally (Subtract)
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Varvara68 [4.7K]
2 white roses.

A dozen is 12.
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4 years ago
Solve the system by substitution <br><br> -x-y-z= -8<br><br> -4x+4y+5z= 7<br><br> 2x+2z= 4
Gennadij [26K]
- x - y - z = - 8 ------- (1)
- 4x + 4y + 5z = 7 -------- (2)
2x + 2z = 4 --------- (3)

From (3): x + z = 2
                      x = 2 - z --------- (4)

Substitute (4) into (1),
- x - y - z = - 8
- (2-z) - y - z = - 8
- 2 + z - y - z = -8
- 2 - y = - 8
2 + y = 8
Therefore, y = 6

Substitute y = 6 and (4) into (2),
- 4x + 4y + 5z = 7
- 4(2 - z) + 4(6) + 5z = 7
- 8 + 4z + 24 + 5z = 7
9z + 16 = 7
9z = - 9
Therefore, z = - 9

Substitute z = - 9 into (4),
x = 2 - z
x = 2 - (-9)
x = 2 + 9
Therefore x = 11

Solution:
x = 11
y = 6
z = -9
4 0
3 years ago
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the moon is about 240,000 miles from earth. what is this distance written as a whole number multiplied by a power of ten.?
Sphinxa [80]
24 (being the part of the number that was first) would be multiplied by 10000, note the fact that the amount of zeros multiplied was equal to the amount of zeros in the problem.

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4 years ago
2x2 − 2z4 + y2 − x2 + z4 if x = −4, y = 3, and z = 2.
gavmur [86]
2(-4)2=-16
-2(2)4=-16
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8+8=16+6=22-16=6-16=-10
-10 is the final answer.
6 0
3 years ago
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