The mass of the radioactive sample at the beginning of the 8th day of the experiment a_13=310.7.
In a lab experiment, the decay of a radioactive isotope is being observed.
At the beginning of the first day of the experiment, the mass of the substance was 1300 grams and the mass decreased by 6% per day.
What is the formula of the nth term?
[tex]a_n=a_1r^{n-1}[/tex]
Use the given value in the formula so we get,
[tex]a_{13}=1100(0.9)^{13-1}[/tex]
Simplify the given term
[tex]a_{13}=310.7[/tex]
Therefore, The mass of the radioactive sample at the beginning of the 8th day of the experiment a_13=310.7.
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Answer:
389
Step-by-step explanation:
Which of the following describes the data set 6,8,13,15,21,23,31
Answer:
what are the answer choices?
i'll edit my answer if you give them to me and i know the answer
Step-by-step explanation:
Answer:
It has two numbers per turn. The first is 2 and stays the same the whole time. The second number starts as 5, but every time it hits that number, it increases by 1.
Step-by-step:
As we already know, two starts off the turn, so every number on this turn will increase by 2 (6+2=8.)
Now, for this one, we have five, so for this turn we'll increase it by that much (8+5=13).
However, this number won't stay at 5. Instead, it will increase by 1 every time we hit this turn. Let's continue one:
Turn Two = 13+2=15
Turn 5+1 = 6 = 15+6=21
Turn Two = 21+2=23
Turn 6+1 = 7 = 23+7=31
And from there, the pattern would/will continue!
Hope this helped! <3
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The school nurse took care of five students on Monday and four of the five students had a cough. The school nurse determined that 80% of the students in her school were coming down with colds. Which of the following would best describe why her conclusion was invalid?
Answer:
It is not valid because she only saw 5 students and that's not a large enough sample for the whole school.
Step-by-step explanation:
While 4/5 IS 80%, the nurse assumed that 80% of ALL of the students in the school were coming down with colds. This is not true since only 4 students had colds. If she were specific and said that 4/5 students who visited her on Monday were 80% coming down with colds, she'd be right. But she isn't since she's assuming it's 80% of the whole school's population of students.
What is the 11th term of the geometric sequence: -2, 10, -50, 250, ...
Answer:
6144
Step-by-step explanation:
I have to have a lot of words so how you doing, great ok bye now good luck
Help me out. Mathmatics
Answer: A. 5.6267 X 10^8
Step-by-step explanation:
(5.62 X 10^8) + (6.7 X 10^5)= 562670000
Which has 8 numbers after 5
5.6267 X 10^8 has 8 as well just minus the zeroes
Malcolm is filling bags with rice. He starts with a 5
1 over 4 pound container of rice and fills each
bag with pound of rice. How many bags of rice can Malcolm fill?
(I think that says 51...)
Basically all you do is multiply 51 by 4
51
x 4
104
The answer (if those numbers are correct) is 104.
Daria makes and sells stuffed toys she uses special fabric to cover a funky to make a number two how much fabric did Daria use to make this number cube
The question is incomplete as the side lengtb of the cube isn't given. Taking the side length to b
be a value, x
Answer:
Step-by-step explanation:
Given that :
The side length = x
To obtain the amount of fabric which would be required for covering the funky, we Obtian the total surface area of the foam. Cube.
Using he relation :
Surface area of a cube = 6 * s² ; the side length s = x
Surface area = 6 * x².
Hypothetically,
Let x = 7 cm
E
Please Help Me :((.
Answer:
4.2 h
Step-by-step explanation:
12 * (50%-15%) = 4.2 h
what is a decimal that is equivalent to 22 over 100?
Answer:
0.22
Step-by-step explanation:
WILL MARK BRAINLIEST PLS HELP
someone help me with this please
LOOK AT PIC! which table shows y as a function of x?
Answer:
H
Step-by-step explanation:
It's the only table that its y never changes.
Please give me BRAINLIEST and a THANKS lol.
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Select the expression that represents the following statement: 45 divided by one fifth the product of 3 and 5. (4 points)
Group of answer choices
45 ÷ (3 x 5 x one fifth )
(45 ÷ one fifth ) x 3 − 5
45 ÷ ( one fifth x 3 + 5)
45 − one fifth x 3 x 5
Answer:
The Answer is C
The table shows a linear function.
X
у
-1
5
0
2
3
-7
8
-22
What is the slope of the table?
OOT
Answer:
-3
Step-by-step explanation:
:)
Which equation represents a line which is parallel to the line y = -5x – 7?
Answer:y=7 is the equation of a line. The line has a y-value of 7 no matter what x-value is given.
Step-by-step explanation:
Answer:
any equation that has -5x +/- any number
Step-by-step explanation:
All you have to do to create an equation that is parallel is keep the slope the same but change its be value. (y = mx + b) <---- keep the mx the same
Manager Mark counted the number of innings each Shire Sharks pitcher pitched during the Soiltop Tournament. Calvin pitched 11 innings, Brody pitched 5 innings, Thom pitched 12 innings, Shawn pitched 7 innings, and Harley pitched 5 innings.
Find the mean absolute deviation (MAD) of the data set.
Answer:
Step-by-step explanation: 55
a runner ran 2/3 of 5 km race in 21 minutes how long does it take to run the entire race
Answer:
31.5 min
Step-by-step explanation:
you divide 21 in hald to get 10.5 which is 1/3 to multiply by 3 for a whole race getting 31.5
Help please and thatn you plzzzzzzzzzzzzzzzz ill give more points
Answer:
yooooooo wus up
Step-by-step explanation:
click point (7,5)
Marking brainliest!!
What are the factors of 391, and how did you find them?
Answer:
1, 17, 23, 391
Step-by-step explanation:
17x23 or 1x391
In ΔKLM, k = 76 inches, l = 30 inches and m=69 inches. Find the measure of ∠M to the nearest degree. pleseeeeee
Answer: 65
Step-by-step explanation:
Measure of ∠M to the nearest degree is [tex]65^{0}[/tex].
What is law of cosine?The law of cosine states that the square of any one side of a triangle is equal to the difference between the sum of squares of the other two sides and double the product of other sides and cosine angle included between them.
Given
k = 76 inches
l = 30 inches
m = 69 inches
From the law of cosines
Cos <M = [tex]\frac{k^{2} +l^{2} -m^{2} }{2.k.l}[/tex]
Cos <M = [tex]\frac{76^{2} +30^{2} -69^{2} }{2.76.30}[/tex]
Cos <M = [tex]\frac{1915}{4560}[/tex]
Cos <M = 0.42
<M = [tex]cos^{-1} (0.42)[/tex]
<M ≈ [tex]65^{0}[/tex]
Hence, measure of ∠M to the nearest degree is [tex]65^{0}[/tex].
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John wanted to buy his favorite rubber shoes. Its original price is $105. He is lucky today because the shoes that he wanted to buy is 30% off the original price. How much will John pay now for his shoes?
Answer:
The answer is 31.5
Step-by-step explanation:
Discount = Original Price x Discount %/100
Discount = 105 × 30/100
Discount = 105 x 0.3
You save = $31.50
Line A is perpendicular to Line B. If the slope of A is -1/7, what is the slope of Line B?
Answer:
m = 7
Step-by-step explanation:
Perpendicular slopes are negative reciprocals so:
m of A = -1/7
m of B = 7
y=6x+4
y=-3-5
how would you find the x and y values?
Step-by-step explanation:
Substitution
substitute -3-5 into y
it becomes -3-5=6x+4
solve the equation to find the answer for X
then substitute the value of X you found again into the equation to find Y
If a die is rolled, what is the probability of getting an even number?
note: write your answer as a decimal
Answer:
The probability of getting an even number is 0.5
Step-by-step explanation:
No. of events (s)=6
Even numbers (E)=3
So, Probability of getting an even number=(s)/(E)
=6/3
=1/2
=0.5
10. On one night, a group of 9 rats carried away 45 kg of food. What is the reduced ratio of rats to food weight
Answer:
Number of rats : Food weight = 1 : 5
Step-by-step explanation:
Number of rats in the group = 9
Weight of food carried away by them = 45 kg
Ratio of the number of rats and food weight = [tex]\frac{\text{Number of rats}}{\text{Weight of food carried by the rats}}[/tex]
= [tex]\frac{9}{45}[/tex]
= [tex]\frac{1\times 9}{5\times 9}[/tex]
= [tex]\frac{1}{5}[/tex]
Therefore, Number of rats : Food weight = 1 : 5
How to find median of a triangle with coordinates
Tyler pays $22.10 for 2.6 pounds of chocolate covered cherries. What is the price per pound of the chocolate covered cherries?
Answer:
$8.50
Step-by-step explanation:
[tex]\frac{y}{22.10} =\frac{1}{2.6}[/tex]
2.6 × y = 22.1 × 1
2.6y = 22.1
2.6y ÷ 2.6 = 22.1 ÷ 2.6
y = 8.5
Answer: 8.50
Step-by-step explanation: 8.50
Step-by-step explanation:
Divide $22.10 over 2.6 pounds of covered cherries
Name that meme
-For 50 Points
MATH MATH MATH MATH HeLp
Answer:
B is the correct option dear .
Step-by-step explanation:
Good luck ^_^
Answer:
I think its B
Step-by-step explanation:
If you were asked to round the number 9.6173 to the nearest hundredths place, how many digits would you have after the decimal point?
Answer: I don't think you would move it
Step-by-step explanation: let me know if I'm wrong
x/12-5>-2 please help
Answer:
The inequality for x is x > 36
(In interval notation form it is (36, ∞)
Step-by-step explanation:
Multiply to remove the fraction, then set equal to zero and solve.
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