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amid [387]
3 years ago
6

Length Width Pls help me

Mathematics
1 answer:
svetoff [14.1K]3 years ago
3 0
These are the steps needed for this question hope this helps if there is any more questions do feel free to ask them

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which of the following is a solution of 2cos^2x-cost-1=0 a. 0 degrees b. 150 degrees c. 180 degrees d. 210 degrees
Luba_88 [7]

Answer:

{0, 150} degrees

Step-by-step explanation:

Given 2cos^2x-cost-1=0, let's simplify this problem by temporarily replacing cos x with y:

2y^2 - y -1 = 0

This can be solved by factoring:  (2y + 1)(y - 1) = 0.  From this we get two solutions:  y = -1/2 and y = 1.

Remembering that we let y = cos x, we now solve:

cos x = -1/2 and cos x = 1.

Note that cos x = 1 when x = 0 and the "adjacent side" coincides with the hypotenuse.

cos x = -1/2 when the hypotenuse is 2 and the "adjacent side" is -1.  This has two solutions between 0 and 360 degrees:  150 degrees and  270 degrees.

Four answer choices are given.  Both (a) (0 degrees) and (b) (150 degrees) satisfy the original equation.  Thus, the solution set is {0, 150} (degrees).

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3 years ago
Estimate the product of 86 and 492
Aleks04 [339]
86 × 492 = about 42,000
7 0
3 years ago
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I'LL GIVE BRAINLIST JUST PLZ HELP ME
Evgen [1.6K]

Answer:

12 * 24 * 17 = 4896

10 * 12 * 4 = 480

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the volume is 5376 cubic inches.

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N76 [4]

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half dollar, quarter, dime and nickel

Step-by-step explanation:

When you sum it up it will give you 90 cents.

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2/3 x 1/10
= 2/30
= 1/15
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