3 years ago

A horse gallops 8 miles in 30 minutes. How many hours would it take the horse

Mathematics

1 answer:

Alexus [3.1K]3 years ago

3 0

It well take 3 hours I think

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Exercise 2.1.47 Prove that ifA^-1 exists and AX=0 then X =0.

stepan [7]

Answer:

Step-by-step explanation:

If $A^{-1}$ exist, then we have that $A^{-1}\cdot A=1$ .

Therefore, in the case that $AX=0$ , if we multiply both

terms in the equation by $A^{-1}$ , then we have

$A \cdot A^{-1}X=A^{-1}0$

and so the equation tells us that

$X=A\cdot A^{-1}X=A^{-1}0=0$ .

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3 years ago

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leonid [27]

Answer:

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Step-by-step explanation:

Side 1= x

Side 2= x+20

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Side 5= x+80

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x+x+20+x+40+x+60+x+80= 401

Simplify it...

5x=201

x= 40.2

This is the answer= 40.2

Please award me brainliest!

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