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4 years ago

Please Please Please Please help!!#19

Mathematics

1 answer:

photoshop1234 [79]4 years ago

3 0

Im not good with math sry

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Consider the equation:

Ludmilka [50]

Answer:

x^2 - 6x - 55 = 0

using calculator apply mode 5 3 and write nmbrs

1 , -6 , -55

answers must be 11 and -5

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3 years ago

Analytically show that the equation below represents trigonometric identity statements for questions 5-7

FrozenT [24]

Analytically show that the equation below represents trigonometric

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2 years ago

Element X decays radioactively with a half life of 12 minutes. If there are 160

Salsk061 [2.6K]

Answer:

It would take 75.8 minutes for the element to decay to 2 grams.

Step-by-step explanation:

The number of grams of element x, after t minutes, is given by the following equation:

$X(t) = X(0)(1-r)^{t}$

In which X(0) is the initial amount and r is the decay rate.

There are 160 grams of Element X

This means that X(0) = 160.

$X(t) = X(0)(1-r)^{t}$

$X(t) = 160(1-r)^{t}$

Half life of 12 minutes.

This means that X(12) = 0.5*X(0) = 0.5*160 = 80. So

$X(t) = 160(1-r)^{t}$

$80 = 160(1-r)^{12}$

$(1 - r)^{12} = 0.5$

$\sqrt[12]{(1 - r)^{12}} = \sqrt[12]{0.5}$

$1 - r = 0.9438$

$X(t) = 160(1-r)^{t}$

$X(t) = 160(0.9438)^{t}$

How long would it take for the element to decay to 2 grams?

This is t for which X(t) = 2. So

$X(t) = 160(0.9438)^{t}$

$2 = 160(0.9438)^{t}$

$(0.9438)^{t} = \frac{2}{160}$

$\log{(0.9438)^{t}} = \log{\frac{2}{160}}$

$t\log{0.9438} = \log{\frac{2}{160}}$

$t = \frac{\log{\frac{2}{160}}}{\log{0.9438}}$

$t = 75.8$

It would take 75.8 minutes for the element to decay to 2 grams.

6 0

3 years ago

Find measures of x,y, and z ? In picture

Ira Lisetskai [31]

Answer:

x=52

y=25

z=90

Step-by-step explanation:

x= 180-38-90=52

y= 180-(65+52)-38=25

z=180-65-25=90

4 0

4 years ago

If your string is 95 cm long and the second string is 650 mm, then how many mm are the two line segments together

Fed [463]

Answer:

1600mm

Step-by-step explanation:

total length of the line segment = length of the first string + length of the second string

to add the strings together, convert the length of the first string to millimetre

1cm = 10mm

95 x 10 = 950mm

950mm + 650mm = 1600mm

8 0

3 years ago