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4 years ago

The sum of the two digits of a number is 9. If the tens digit is one-half the units digit, what is the number?

Mathematics

2 answers:

Paul [167]4 years ago

7 0

Answer:

$t=\frac{u}{2}$ would complete the system

Number is 36

Step-by-step explanation:

Let t = the tens digit, u = the units digit

We have the sum of the two digits of a number is 9

t + u = 9

We also have the tens digit is one-half the units digit

$t=\frac{u}{2}$

Substituting

$\frac{u}{2}+u=9\\\\\frac{3u}{2}=9\\\\u=6$

t + 6 = 9

t = 3

So the number is 36.

Arte-miy333 [17]4 years ago

6 0

Answer: correct answer is t=1/2u

Step-by-step explanation:

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nata0808 [166]

Answer:

$y=2x+7$

Step-by-step explanation:

The correct question is

what is the equation for a line passing through (-2,3) and perpendicular to y= -1/2x+1 ?

Remember

If two lines are perpendicular, then their slopes are opposite reciprocal (the product of their slopes are equal to -1)

The slope of the given line is m=-1/2

the opposite reciprocal is m=2

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substitute

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isolate the variable y

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$\bf \qquad \qquad \textit{ratio relations}
\\\\
\begin{array}{ccccllll}
&Sides&Area&Volume\\
&-----&-----&-----\\
\cfrac{\textit{similar shape}}{\textit{similar shape}}&\cfrac{s}{s}&\cfrac{s^2}{s^2}&\cfrac{s^3}{s^3}
\end{array} \\\\
-----------------------------\\\\
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-------------------------------\\\\$

$\bf \cfrac{smaller}{larger}\qquad \cfrac{s}{s}=\cfrac{\sqrt{48\pi }}{\sqrt{75\pi }}\implies \cfrac{s}{s}=\cfrac{\sqrt{(2^2)^2\cdot 3}}{\sqrt{5^2\cdot 3}}\implies \cfrac{s}{s}=\cfrac{4\sqrt{3}}{5\sqrt{3}}
\\\\\\
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