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Ronch [10]
3 years ago
5

The half life of a particular radioactive substance is 1 year. If yiu started with 50 grams of this substance, how much of it wo

uld remain after 3 years.
Mathematics
1 answer:
Alenkinab [10]3 years ago
5 0

Answer:

Remaining amount is 6.25 grams

Step-by-step explanation:

I had the same question not to long ago

one year what you would be left with is 50/2 which is 25 gram

second year, you would be left with 50/4 which is 12.5

third year what's left is 50/8 i.e 6.25

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Which of the following sets of values is a soulution to the following system of liner expressions, 4x+y=24 x-y=-4
aleksandrvk [35]
Hope this helps. I think it's right? haha haven't done this in a while.

7 0
3 years ago
The mean waiting time at the drive-through of a fast food from the time the order is placed to the time the order is recieved is
Alexxandr [17]

Answer:

1.) No ;

2.) - 0.931

3.) 0.1785

Step-by-step explanation:

Given :

μ = 84.3 ; xbar = 81.9 ; s = 17.3

H0 : μ = 84.3

H1 : μ < 84.3

The test statistic :

(xbar - μ) ÷ (s/√(n))

(81.9 - 84.3) / (17.3/√45)

-2.4 / 2.5789317

= - 0.9306

= - 0.931

Using the test statistic, we could obtain the Pvalue : df = n - 1 ; df = 45 - 1 = 44

Using the Pvalue calculator :

Pvalue(-0.9306, 44) = 0.1785

Using α = 0.05

The Pvalue > α

Then we fail to reject H0; and conclude that there is no significant evidence to support the claim that the mean waiting time is less than 84.3

5 0
2 years ago
The sales tax on a piece of furniture that cost $450 was 28.13 . what was the percent sales tax?
inysia [295]
28.13÷450= .0625111

.0625111×100= 6.25111%
4 0
3 years ago
In Devon's school, the morning session runs for a total of 182 minutes. The morning session
natima [27]

Answer:

Every class period is 43 minutes long.

Equation:

(m - 10) ÷ 4

3 0
3 years ago
Showing ALL calculations, whether this statement is valid
choli [55]

Answer:

<em>R</em><em>M</em>79 608.51

Step-by-step explanation:

First year,

<em>RM</em>505 050.00×5%=<em>RM</em>505 050.00×5/100

=<em>RM</em>25 252.50

second year,

(<em>RM</em>505 050.00+<em>R</em><em>M</em>25 252.50)×5%=<em>RM</em>530 302.50×5/100

=<em>RM</em>26 515.13

third year,

(<em>R</em><em>M</em>530 302.50+<em>R</em><em>M</em>26 515.13)×5%=<em>R</em><em>M</em>556817.63×5/100

=<em>R</em><em>M</em>27840.88

three years interest,

<em>RM</em>25 252.50+<em>RM</em>26 515.13+<em>RM</em>27840.88=<em>RM</em>79608.51

<em><u>I</u></em><em><u> </u></em><em><u>d</u></em><em><u>o</u></em><em><u>n</u></em><em><u>'</u></em><em><u>t</u></em><em><u> </u></em><em><u>k</u></em><em><u>n</u></em><em><u>o</u></em><em><u>w</u></em><em><u> </u></em><em><u>t</u></em><em><u>h</u></em><em><u>a</u></em><em><u>t</u></em><em><u> </u></em><em><u>i</u></em><em><u>s</u></em><em><u> </u></em><em><u>R</u></em><em><u> </u></em><em><u>o</u></em><em><u>r</u></em><em><u> </u></em><em><u>R</u></em><em><u>M</u></em><em><u> </u></em>

<em><u>i</u></em><em><u>f</u></em><em><u> </u></em><em><u>i</u></em><em><u>t</u></em><em><u> </u></em><em><u>i</u></em><em><u>s</u></em><em><u> </u></em><em><u>R</u></em><em><u> </u></em><em><u>,</u></em><em><u>s</u></em><em><u>o</u></em><em><u>r</u></em><em><u>r</u></em><em><u>y</u></em>

<u>H</u><u>o</u><u>p</u><u>e</u><u> </u><u>c</u><u>a</u><u>n</u><u> </u><u>h</u><u>e</u><u>l</u><u>p</u><u>!</u>

8 0
3 years ago
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