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nadezda [96]
2 years ago
15

The equation C(l) = l3 – l2 + l + 2.5 models the cost to mail a package as a function of its length. To the nearest quarter inch

, approximately what is the length of a package that costs $11.00 to mail? Enter your answer as a decimal.
inches

Mathematics
2 answers:
Shalnov [3]2 years ago
7 0

Answer: 2.25

Step-by-step explanation:

Anettt [7]2 years ago
6 0

Answer:

Step-by-step explanation:

Set the cost equation C(l) = l3 – l2 + l + 2.5 equal to $11.00 and solve for l:

                                     C(l) = 2l + 2.5 = $11, or

                                               2l = 8.5, or l = length = 4.25 inches

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Step-by-step explanation:

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sin 30° = h / 12

h = 12 sin 30°

h = 6 cm

2) Draw a picture of the rectangle.

∠KML is the angle the diagonal makes with the shorter side ML.  This angle is 54°.  ∠NKM is the angle the diagonal makes with the shorter side NK.  ∠KML and ∠NKM are alternate interior angles, so m∠NKM = 54°.

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KLMN is a rectangle, so it has right angles.  That means ∠KML and ∠KMN are complementary.  So m∠KMN = 36°.

We now know the measures of two angles of triangle KPM.  Since angles of a triangle add up to 180°, we can find the measure of the third angle:

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7 0
3 years ago
What is the answer to this 14-2y=​
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Step-by-step explanation:

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