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2 years ago

13

Can someone tell me the answer to that question plsss and thank you

2 answers:

Tanzania [10]2 years ago

8 0

Your answer here would be A. because every hour she travels 3 miles so 3h. (3 × h). Then you add the 5 miles you know she at least walked. Put it together and you get 3h + 5. Hope this helped :)

Ipatiy [6.2K]2 years ago

7 0

The answer would be A :)

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Answer:

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Step-by-step explanation:

We want to determine the positive base b in which:

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The easiest way to approach this is to convert all the numbers to base 10.

$5_b=5Xb^0=5\\23_b =(2Xb^1)+(3Xb^0)=2b+3\\151_b=(1Xb^2)+(5Xb^1)+(1Xb^0)=b^2+5b+1\\Therefore:\\5_b \cdot 23_b = 151_b\\5(2b+3)=b^2+5b+1\\10b+15=b^2+5b+1\\b^2+5b+1-10b-15=0$

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Next, we factorize the resulting expression.

$b^2-5b-14=b^2-7b+2b-14=0\\b(b-7)+2(b-7)=0\\(b-7)(b+2)=0\\b-7=0\: or \: b+2=0\\b=7\: or \: b=-2$

The positive value of b for which the equality hold is 7.

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