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2 years ago

Suppose matrix D is the inverse of matrix C. Which of the following is equal to D?

Mathematics

2 answers:

denpristay [2]2 years ago

7 0

CDD cause CD=I and then ID=D

Hope I helped.

mr Goodwill [35]2 years ago

6 0

Answer: (A) CDD

if D=C^-1

then

C D D = (C C^-1) D = I D = D

(where I is the identity matrix)

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Line BD is tangent to circle O at C, Arch AEC = 299, and ACE = 93. Find Angle DCE.

VladimirAG [237]

In triangle ACE,
we know C=93,E can be calulated by using arch angle AEC...what ever that is....,using this we get A=180-(E+93)

So, by alternate segment theorem, DCE= A.

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2 years ago

Complete the steps 4/9 divided by 1/2

DedPeter [7]

Answer: 0.88 (the 8 recurs)

Step-by-step explanation:

$\frac{4}{9}$ ÷ $\frac{1}{2}$

$\frac{4}{9}$ × $\frac{2}{1}$ (Then the the fraction should reciprocal so the values should shift to the opposite side were 2 goes up and 1 goes down and the sign turns to the multiplication sign)

then u should multiply the two fractions which gives 8/9

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1 year ago

A diver is 25 feet below sea level. After he swims up 15 feet toward the surface, what is his elevation?

Nataly [62]

The person above me is right!! I kinda got confused because i thought it was asking what sea level is the diver now BUT its asking for the elevation, so you need to subtract.

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2 years ago

Is 6 15/28 or 6 5/9 bigger?

spayn [35]

Answer:

$6 \frac{5}{9}$

is greater than

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2 years ago

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A contractor has installed a silt fence around an area that is semi-circular and level to prevent soil from the construction sit

monitta

We know is a semi-circle, so let us use the equation for the area of a circle instead, and then, half it
so, the diameter is 1100, meaning the radius is half that, or 550

so... $\textit{area of a circle}=\pi r^2\qquad r=radius=\frac{diameter}{2}=\frac{1100}{2}=550
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\\ \quad \\
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\\ \quad \\
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2 years ago