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3 years ago

Please help on this question!

Mathematics

1 answer:

Alekssandra [29.7K]3 years ago

3 0

Answer:

(-4,-2)

Step-by-step explanation:

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What is the probability of drawing a red, not replacing it, and then drawing another red card?

umka21 [38]

If your asking for a standard deck of cards the probability is 1/8

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3 years ago

The sum of 21 and n is equal to 43.23 <br><br> please help me!!! <br> I’ll give out 30 points!!!

Assoli18 [71]

Equation: 21+n=43.23

Process to find n

21+n=43.23
Subtract 21 from both sides
n=22.23

8 0

2 years ago

Read 2 more answers

hus, D satisfying (ABC)DequalsI exists. Why does the expression for D found above also satisfy D(ABC)equalsI, thereby showing

Assoli18 [71]

Complete Question

The complete question is shown on the first uploaded image

Answer:

First Question

Option A is correct

Second Question

Option C is correct

Third Question

$D = A^{-1} * B^{-1} * C^{-1}$

Fourth Question

So substituting for D in (ABC) D = I

$(ABC) * A^{-1} * B^{-1} * C^{-1} = I$

$I = I$

This proof that ABC is invertible

Step-by-step explanation:

From the question we are told that

A , B and C are invertible which means that $A^{-1} , B^{-1}, C^{-1}$ exist

Now

From the question

(ABC) D = I

Where I is an identity matrix

Now when we multiply both sides by $A^{-1}$ we have

$A^{-1} A BCD = A^{-1} * I$

$IBCD = A^{-1}$

Now when we multiply both sides by $B^{-1}$ we have

$B^{-1 } *I BCD = A^{-1} * B^{-1}$

$I CD = A^{-1} * B^{-1}$

Now when we multiply both sides by $C^{-1}$ we have

$C^{-1} * I CD = A^{-1} * B^{-1} * C^{-1}$

$I D = A^{-1} * B^{-1} * C^{-1}$

$D = A^{-1} * B^{-1} * C^{-1}$

So substituting for D in the above equation

$(ABC) * A^{-1} * B^{-1} * C^{-1} = I$

$I = I$

This proof that ABC is invertible

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3 years ago

- Save and Exit

stich3 [128]

Answer:

jjsjwnen e enejwjjqjqjjwneje

6 0

2 years ago

Initially 100 milligrams of a radioactive substance was present. After 6 hours the mass had decreased by 2%. If the rate of deca

LenaWriter [7]

The amount of radioactive material remaining after 24 hours is 92.15 kg.

<h3>Exponential function</h3>

An exponential function is in the form:

y = abˣ

where y, x are variables, a is the initial value of y and b is the multiplier.

Let y represent the amount of the substance after t hours.

From the equation, a = 100 mg

Also, after 6 hours:

$100-100*2\%=100b^6\\\\98=100b^6\\\\b=0.9966$

After 24 hours:

y = 100(0.9966)²⁴ = 92.15 kg

The amount of radioactive material remaining after 24 hours is 92.15 kg.

Find out more on Exponential function at: brainly.com/question/12940982

4 0

2 years ago