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Monica [59]
3 years ago
13

Someone please help. I don’t understand these

Mathematics
1 answer:
WITCHER [35]3 years ago
3 0

Answer: very too bad for you buddy study nexts time



Step-by-step explanation:


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The surface area of the cube is 384 square mm. Hope it help!
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The approximate molar concentration of several chemicals are given. Find the pH of each use the calculator and round to the near
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Explanation:

Formula to calculate pH of a chemical or solution is as follows.

                    pH = -log [H^{+}]

Therefore, calculate the pH of given chemicals as follows.

1). Oven cleaner

              pH = -log [H^{+}]

                    = -log [10^{-13}]

                    =  13

2). Water

               pH = -log [H^{+}]

                     = -log [7 \times 10^{-7}]

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3). Blood

               pH = -log [H^{+}]    

                     = -log [4 \times 10^{-8}]

                     = 7.40

4). Vinegar

                pH = -log [H^{+}]    

                      = -log [63 \times 10^{-4}]

                      = 2.20          

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Find the solution of this system of equations<br> 4x + y = 3<br> 4x - y = -5
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The measure of an angle that is its own supplement is
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Answer: 90 degrees

============================

Explanation:

Let x and y be the two angles. Because they are supplementary angles, this means x+y = 180. Also since we're told that the angle is its own supplement, we can say that y = x.

Consequently, we can replace y with x and solve for x like so:

x+y = 180

x+x = 180 .... y is replaced with x since y = x

2x = 180

2x/2 = 180/2

x = 90

This means y = 90 as well. As a check, note how

x+y = 90+90 = 180

which verifies our answer.

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