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2 years ago

The value of r? Do not round your answer.

Mathematics

1 answer:

bearhunter [10]2 years ago

8 0

Answer:

r = 31.2

Step-by-step explanation:

Δ ACE and Δ BCD are similar, thus the ratios of corresponding sides are equal, that is

$\frac{AE}{BD}$ = $\frac{CE}{CD}$ , substitute values

$\frac{r}{19.5}$ = $\frac{64}{40}$ ( cross- multiply )

40r = 1248 ( divide both sides by 40 )

r = 31.2

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Can someone please check this?

Naddik [55]

The first one in incorrect , it should be 130 but the rest are correct !

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3 years ago

Probability The average time between incoming calls at a switchboard is 3 minutes.if a call has just come in,the probability tha

Stels [109]

Answer:

a) 0.1535

b) 0.4866

c) 0.8111

Step-by-step explanation:

The probability that the next call come within the next t minutes is:

$p(t) = 1 -e ^{- t/3}$

According to this model,

a) the probability that a call in comes within 1/2 minutes is $p(t) = 1 -e ^{- (1/2)/3}$ =0.1535

b) the probability that a call in comes within 2 minutes is $p(t) = 1 -e ^{-2/3}$ =0.4866

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2 years ago

What’s is the surface area of this

Marysya12 [62]

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2 years ago

Compare -4 ____ -12 9 ___ -35

omeli [17]

-4 < -12 and 9 > -35

Hope this helps!

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2 years ago

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Gwar [14]

Answer:

the answer is D

Step-by-step explanation:

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2 years ago