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3 years ago

Without doing the math, determine which is greater, 40 times 1/4 or 40 divided by 1/4. Explain your reasoning.

Mathematics

2 answers:

Vinil7 [7]3 years ago

6 0

40 times 1/4 is greater because you cant divide 1/4

Inessa05 [86]3 years ago

3 0

40÷1/4 because when you didvide it you get 160. When you multiply it, you get ten.

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Perimeter of a triangle (combine like terms)

patriot [66]

Answer:

6x+3

Step-by-step explanation:

(x+4)+(3x-2)+(2x+1)

=x+4+3x-2+2x+1

=x+4+3x-2+2x+1 --> Here I'm just bolding the variables. This makes it easier to combine like terms in the next line.

=6x+4-2+1

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5 0

2 years ago

Read 2 more answers

One hundred items are simultaneously put on a life test. Suppose the lifetimes

romanna [79]

Answer:

a) $\mathrm{E}[\mathrm{T}]=\sum_{\mathrm{H}}^{5} \frac{200}{101-i}$

b) $\mathrm{Var}[\mathrm{T}]=\sum_{k=1}^{5} \frac{(200)^{2}}{(101-i)^{2}}$

Step-by-step explanation:

Given:

The lifetimes of the individual items are independent exponential random variables.

Mean = 200 hours.

Assume, Ti be the time between ( $i-1$ )st and the $ith$ failures. Then, the $T_{i}$ are independent with $\mathrm{T}_{\mathrm{i}}$ being exponential with rate $\frac{(101-i)}{200} .$

Therefore,

a) $E[T]=\sum_{i=1}^{5} E\left[\tau_{i}\right]$

$=\sum_{i=1}^{5} \frac{200}{101-i}$

$\therefore \mathrm{E}[\mathrm{T}]=\sum_{\mathrm{H}}^{5} \frac{200}{101-i}$

$b)$

The variance is given by, $\mathrm{Var}[\mathrm{T}]=\sum_{i=1}^{5} \mathrm{Var}[T]$

$\therefore \mathrm{Var}[\mathrm{T}]=\sum_{k=1}^{5} \frac{(200)^{2}}{(101-i)^{2}}$

7 0

3 years ago

A recipe calls for 3/4 cup of sugar for every 3 cups of flour.How many flour should be used for every 1 cup of sugar ?

vivado [14]

You need 1/4 of sugar per cup of flour. So you need 4 cups of flour for every one cup of sugar

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3 years ago

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marishachu [46]

Answer:

c. 20%

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6 0

2 years ago

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Vitek1552 [10]

Answer:

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Step-by-step explanation:

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3 0

3 years ago