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3 years ago

Find the common difference of the arithmetic sequence -17, -15, -13, ...

Mathematics

2 answers:

juin [17]3 years ago

7 0

Answer:

term 1 - term 2 = sequence

-17-(-15) = -2

and if you minus the rest by -2 it will give you the next term

-15-(-2) = -13

-13-(-2) = -11

disa [49]3 years ago

3 0

Answer:

Step-by-step explanation:

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Sonbull [250]

Answer:

$x=\boxed{6.6}$

$\overline{\sf DE}=\boxed{13.2}\:\:\sf units$

Step-by-step explanation:

Geometric Mean Theorem - Altitude Rule

The altitude drawn from the vertex of the right angle perpendicular to the hypotenuse separates the hypotenuse into two segments. The ratio of one segment to the altitude is equal to the ratio of the altitude to the other segment:

$\sf \dfrac{segment\:1}{altitude}=\dfrac{altitude}{segment\:2}$

From inspection of the given diagram:

altitude = FD = 9
segment 1 = CD = 5
segment 2 = DE = $2x+3$

$\begin{aligned}\sf \dfrac{segment\:1}{altitude} & = \sf \dfrac{altitude}{segment\:2}\\\\\implies \dfrac{5}{9} & = \dfrac{9}{2x+3}\\\\5(2x+3) & = 81\\\\10x+15 & = 81\\\\10x & = 66\\\\ \implies x & = 6.6\end{aligned}$

Substitute the found value of x into the expression for DE:

$\begin{aligned}\sf \overline{DE} & = 2x+3\\\implies \sf \overline{DE} & = 2(6.6)+3\\& = 13.2+3\\& =16.2\:\: \sf units\end{aligned}$

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2 years ago

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Vikentia [17]

Answer:

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Step-by-step explanation:

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4 years ago

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Neko [114]

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Answer:

$\dfrac{20+5\sqrt{3}}{13}$

Step-by-step explanation:

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3 years ago

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Juli2301 [7.4K]

Answer:

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Step-by-step explanation:

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