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san4es73 [151]
2 years ago
5

(Will give Brainliest)

Mathematics
2 answers:
Dvinal [7]2 years ago
8 0

Answer:

b-4.2<-7.5

Step-by-step explanation:

b-4.2<-7.5

this is because the number given as "b" minus 4.2 (as shown on the left) is less than (<) -7.5, so this inequality makes sense.

svet-max [94.6K]2 years ago
8 0

Answer:

b-4.2<-7.5

Step-by-step explanation:

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Find the surface area. Round your answer to the nearest hundredth
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Answer:  569.91\ ft^2

Step-by-step explanation:

From the given picture, the radius of the base of the cylinder = 5.5 ft.

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\sqrt{-2x^2} = \sqrt{-1}  \cdot \sqrt{2}\cdot  \sqrt{x^2} = ix\sqrt2

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2 years ago
Explain the rule in solving inequalities with a negative coefficient.
dimulka [17.4K]

Answer:

  the comparison must be reversed when multiplying by a negative

Step-by-step explanation:

The rules of equality apply to solving inequalities, with the exception that multiplication or division by a negative number reverses the sense of the comparison:

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____

Effectively, multiplication (or division) by a negative number is equivalent to reflection across the origin. Things that were ordered left/right (on the number line) are ordered right/left after such a reflection:

  -2 < -1

  1 < 2

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<em>Additional comment</em>

Application of any function requires that you pay attention to ordering. Some functions naturally reverse the order; others do so only on specific domains.

Consider f(x) = 1/x.

  1 < 2

  f(1) > f(2) . . . . because the slope of the f(x) function is negative everywhere.

__

<em>In the first and second quadrants</em>, the cosine function also reverses order.

  20° > 10°

  cos(20°) < cos(10°)

__

Probably the most commonly encountered function used with inequalities is the absolute value function.

  |x-3| > 2

This function has one domain where the slope is negative, and another domain where the slope is positive.

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     -(x -3) > 2

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  -x > 1

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3 years ago
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