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alekssr [168]
3 years ago
14

The half price of helium-5 is 7.6 X 10 to the power of negative 22 seconds and the half-life helium -9 is 7 x 10 to the power of

negative 21-second approximately how many times greater is the half life of helium and -9 then that of helium -5
Mathematics
1 answer:
Digiron [165]3 years ago
5 0

Answer:

Approximately 9.211 times

Step-by-step explanation:

Given

x = 7.6 * 10^{-22}s --- half life of helium-5

y = 7 * 10^{-21}s --- half life of helium-9

Required

How many times greater is y than x

To do this, we simply divide y by x

\frac{y}{x} = \frac{7 * 10^{-21}s}{7.6 * 10^{-22}s}

\frac{y}{x} = \frac{7 * 10^{-21}}{7.6 * 10^{-22}}

Apply law of indices

\frac{y}{x} = \frac{7 * 10^{-21--22}}{7.6}

\frac{y}{x} = \frac{7 * 10^{-21+22}}{7.6}

\frac{y}{x} = \frac{7 * 10}{7.6}

\frac{y}{x} = \frac{70}{7.6}

\frac{y}{x} = 9.211

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The length of CD is 12 units C’D’ is the image of CD under a dilation with a scale factor of n.Which of these are true?
Korvikt [17]

Answer: FIrst option, Fourth option and Fifth option.

Step-by-step explanation:

First it is important to know the definition of "Dilation".

A Dilation is defined as a transformation in which the Image (which is the figure obtained after the transformation) and the Pre-Image (this is the original figure, before the transformations) have the same shape, but their sizes are different.

If the length of CD is dilated with a scale factor of "n" and it is centered at the origin, the length C'D' will be:

C'D'=nCD=(n)(12\ units)

Therefore, knowing this, you can determine that:

1. If n=\frac{3}{2} , you get:

C'D'=(\frac{3}{2})(12\ units)=18\ units

2. If n=4, then the length of C'D' is:

C'D'=(4)(12\ units)=48\ units

3. If n=8, then:

C'D'=(8)(12\ units)=96\ units

4. If n=2, then, you get that the lenght of C'D' is:

C'D'=(2)(12\ units)=24\ units

5. If n=\frac{3}{4}, the length of C'D' is the following:

C'D'=(\frac{3}{4})(12\ units)=9\ units

8 0
3 years ago
If a number n is subtracted from 15,you get three more than n.What is the value of n?
saul85 [17]
I think the answer is 15

6 0
3 years ago
Which of the following is equivalent to square root of 8?
arlik [135]

Answer:

\sqrt{8} =\sqrt{4*2} =2\sqrt{2}

Step-by-step explanation:

The expression \sqrt{8} is a radical. To simplify pull out any perfect square factors.

\sqrt{8} =\sqrt{4*2} =2\sqrt{2}

Each of these expressions is equivalent.

4 0
3 years ago
Read 2 more answers
Factor 64a^2b^36-1
tankabanditka [31]
64a^2b^{36} -1

= (8ab^{18})^{2} - (1)^2

=(8ab^{18} - 1)(8ab^{18} + 1)

----------------------------------------------------------
Answer: (8ab¹⁸ - 1)(8ab¹⁸ + 1) (Answer 3)
----------------------------------------------------------

3 0
2 years ago
The midpoint of AB is M(-2, -1). If the coordinates of A are (-7, 2), what are the coordinates of B?
slega [8]

Answer:

Coordinates of B is (3,-4)

Step-by-step explanation:\frac{-7+x^{2} }{2}=-2

\frac{2+y^{2} }{2} =-1

You multiply -2 by 2 to get -4 and then create the equation -7+x^{2} = -4 then you substitue -7 for +7 and add +7 to -4 which gives you 3 (x coordinate of B)

You multiply -1 by 2 to get -2 and then create the equation2+y^{2} =-2 then you subtract 2 by -2 which gives you -4 (y coordinate of B)

To check your answer use the midpoint formula ( \frac{x^{1} +x^{2}}{2} ) ( \frac{y^{1} +y^{2}}{2} )=M

\frac{-7+3}{2} =\frac{-4}{2} =-2\\\frac{2+ -4}{2} =\frac{-2}{2} =-1   which will give you the midpoint (-2,-1)

6 0
2 years ago
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