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nata0808 [166]
1 year ago
13

Describe a way to check the correctness of a subtraction answer.

Mathematics
1 answer:
Tamiku [17]1 year ago
3 0

Step-by-step explanation:

Well in general, we can represent subtraction as: x-y=z

"z" represents the difference, and it really just represents x with y taken away. So if we were to "give back" this y value, we should get "x".

This means that: z+y=x

So one way to check, is adding the value that's being subtracted (y value) and the difference (z value), this should get you the value that is being subtracted from (x value). If you don't get the original value that's being subtracted from (x-value) then you know the answer you got is wrong.

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Evaluate 9p^2 for p=4 . When p=4,9p^2=?
Licemer1 [7]

Answer:

  144

Step-by-step explanation:

Put the number where the variable is and do the arithmetic.

  9p^2 = 9·4^2 = 9·16

  9p^2 = 144 . . . . when p=4

6 0
3 years ago
If x = 3 and y = -2, what is the value of the expression x^3-2xy^2?
Nana76 [90]

Answer:

3

Step-by-step explanation:

The expression is x^3-2xy^2. To find the value, substitute the values x = 3 and y =-2 then follow order of operations.

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7 0
3 years ago
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e-lub [12.9K]

Answer:

a). 3M = [ 6.5      1.3      23.4 ]

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5 0
2 years ago
Find the exact value of sin(-15)
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3 years ago
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Answer:

c and d

Step-by-step explanation:

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