3 years ago

3. pH is given by the formula pH = -log [A]

1 answer:

5 0

Well, what I’d do is just see who has the most which is Bill and then for the other question I’d just subtract 7.8 - 7.2 which is equal 6 so the pH is greater by .6

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-2/5 - 4/5 + -9/10 = ???<br><br> Please help, will mark brainliest for answer with an explanation

NeX [460]

Answer:

Step-by-step explanation:

-2/5 - 4/5 + -9/10

= -2/5 - 4/5 - 9/10

= {-2(2) -4(2) - 9)/10

= (-4 - 8 - 9)/10

= -21/10

= -2 1/10

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3 years ago

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ki77a [65]

This will come out to 35.1

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3 years ago

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Lady_Fox [76]

Answer:

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Step-by-step explanation:

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2 years ago

Circle has rad of 1.5m what angle subtended at center of circle by arc of 1m

Mumz [18]

120 degrees or 0.67 radians

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3 years ago

John is standing in his backyard and decides to estimate the height of a tree. He stands so that the tip of his shadow coincides

Andrew [12]

The tree is 820 inches tall using the similarity of triangles.

To get the height of the tree, we will use the properties of similar triangles expressed as:

$\frac{70in}{7ft} = \frac{h}{75ft+7ft}\\\frac{70in}{7ft} = \frac{h}{82ft}\\$

Note that 1 foot = 12inches

7ft = 84in and 82ft = 984in

h is the required height of the tree. Simplify the equation above to get the height "h" and replace feet with inches;

$\frac{70}{84} = \frac{h}{984}\\84h =70 \times 984\\84h = 68,880\\h=\frac{68,880}{84}\\h= 820in$

Hence the tree is 820 inches tall using the similarity of triangles.

Learn more on similarities of triangles here: brainly.com/question/24295402

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3 years ago