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vovangra [49]
3 years ago
9

Error Analysis The length of an object is exactly 20 cm. A student says that a

Mathematics
1 answer:
ioda3 years ago
8 0
Percent errors are calculated by dividing the absolute value of the errors by the exact length. What the student did wrong here is that he or she divided the given measurements by the exact lengths, which should not be the case. 

Correct percent errors:
 19 cm
           percent error = (I19 - 20I / 20) x (100%)  = 5%
 21 cm
           percent error = (I21 - 20I / 20) x (100%) = 5%

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3 years ago
When constructing an angle bisector, why must the arcs intersect?
Black_prince [1.1K]
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Find the area of the region in two ways. a. Using integration with respect to x. b. Using geometry. 9-x
Natali [406]

Answer: hello your question is incomplete attached below is the complete question

answer :

a)   \int\limits^3_0 {(10-x)-(x+4)} \, dx     ( option D )

b) A =  1/2 (6)(3)   ( option B )

c) Area of shaded region = 9

Step-by-step explanation:

<u>a) Using integration with respect to x </u>

Area =   \int\limits^7_4 {(y-4)} \, dy + \int\limits^a_7 {(10-y)} \, dy         ( note a = 10 )

          = y^2/2 - 4y |⁷₄  + 10y - y^2/2 |¹⁰₇

          = 33/2 - 12 + 30 - 51/2   = 9

hence the best integral from the options attached is option D

\int\limits^3_0 {(10-x)-(x+4)} \, dx

= [ 10x - x^2 /2 - x^2/2 - 9x ] ³₀

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<u>b) Using Geometry </u>

Area = 1/2 * base * height

        = 1/2 * 6 * 3

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7 0
3 years ago
Let f(x)=x2+15x+56
Ivan

Answer:

-8, -7

Step-by-step explanation:

f(x)=x^2+15x+56

0 =x^2+15x+56

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0 = (x+8) (x+7)

Then use the zero product property

x+8 =0     x+7 =0

x+8-8 =0-8        x+7-7 =0-7

x=-8                      x=-7

6 0
3 years ago
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The length of a quarter is 0.955 inch. Round the length of a quarter to the nearest tenth of an inch./8925047/32fb89d7?utm_sourc
m_a_m_a [10]
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