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4 years ago

Help me please and thank you!

Mathematics

1 answer:

Alina [70]4 years ago

7 0

Answer:

The first picture and 28.2 square units

Step-by-step explanation:

Equation: A+1/2ps

A = area of the base

p = perimeter of the base

s = slant height

3²+1/2(12)(3.2)=28.2

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How to write one fifth of the square of a number

labwork [276]

$\frac{1}{5}(whaever \: ur \: number \: is) {}^{2}$

4 0

4 years ago

Solve for x: 3|2x - 2| + 6 = 18.

alukav5142 [94]

Answer:

answer: b) x = 3, x = -1

Step-by-step explanation:

3|2x - 2| + 6 = 18.

divid by 3 :

|2x - 2| + 2 = 6

add -2 : |2x - 2| = 4

2x-2=4 or 2x-2=-4

2x=6 or 2x=-2

x=3 or x=-1

4 0

3 years ago

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Please use the picture, remember that 1 triangle is measured inches and the other in Centimeters.

miss Akunina [59]

Answer:

that is a hard question

Step-by-step explanation:

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2 years ago

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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

Y=−2x+8 and y=12x+4 A. paralel B. Perpindicular C.Neither

Elenna [48]

Answer:

C) Neither

Step-by-step explanation:

These two equations are not parallel, because they don't have the same slope. And they're not perpendicular to each other either, because perpendicular lines have negative reciprocals of the slopes. Therefore, the answer is C) Neither.

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3 years ago

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