1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andreev551 [17]
2 years ago
15

Element X decays radioactively with a half life of 9 minutes. If there are 890 grams of Element X, how long, to the nearest tent

h of a minute, would it take the element to decay to 238 grams?
Mathematics
1 answer:
elena-s [515]2 years ago
3 0

Answer:

13.18651685

13.9

Explain:

890-238=652
652/890=0.7325842697 (Find out the percentage)

We know that 1 gram of Element X will be fully decayed in 18 minutes and half of it in 9 minutes.

0.7325842697x18=13.18651685

As you see 18/13.18651685 will equal to 18 (not exactly since it is rounded)

And of course we need to round it to nearest tenth. So the answer would be 13.9!

You might be interested in
Determine if each relation is a function
Archy [21]
No; you can not have an x-value go to more than one y-value
6 0
3 years ago
Read 2 more answers
Pls help here's the attachment
Ilya [14]

Answer:A

Step-by-step explanation:

7 × 3 = 21

10 × 3 = 30

4 0
3 years ago
Read 2 more answers
If the original square had a side length of
irina [24]

Answer:

Part a) The new rectangle labeled in the attached figure N 2

Part b) The diagram of the new rectangle with their areas  in the attached figure N 3, and the trinomial is x^{2} +11x+28

Part c) The area of the second rectangle is 54 in^2

Part d) see the explanation

Step-by-step explanation:

The complete question in the attached figure N 1

Part a) If the original square is shown below with side lengths marked with x, label the second diagram to represent the new rectangle constructed by increasing the sides as described above

we know that

The dimensions of the new rectangle will be

Length=(x+4)\ in

width=(x+7)\ in

The diagram of the new rectangle in the attached figure N 2

Part b) Label each portion of the second diagram with their areas in terms of x (when applicable) State the product of (x+4) and (x+7) as a trinomial

The diagram of the new rectangle with their areas  in the attached figure N 3

we have that

To find out the area of each portion, multiply its length by its width

A1=(x)(x)=x^{2}\ in^2

A2=(4)(x)=4x\ in^2

A3=(x)(7)=7x\ in^2

A4=(4)(7)=28\ in^2

The total area of the second rectangle is the sum of the four areas

A=A1+A2+A3+A4

State the product of (x+4) and (x+7) as a trinomial

(x+4)(x+7)=x^{2}+7x+4x+28=x^{2} +11x+28

Part c) If the original square had a side length of  x = 2 inches, then what is the area of the  second rectangle?

we know that

The area of the second rectangle is equal to

A=A1+A2+A3+A4

For x=2 in

substitute the value of x in the area of each portion

A1=(2)(2)=4\ in^2

A2=(4)(2)=8\ in^2

A3=(2)(7)=14\ in^2

A4=(4)(7)=28\ in^2

A=4+8+14+28

A=54\ in^2

Part d) Verify that the trinomial you found in Part b) has the same value as Part c) for x=2 in

We have that

The trinomial is

A(x)=x^{2} +11x+28

For x=2 in

substitute and solve for A(x)

A(2)=2^{2} +11(2)+28

A(2)=4 +22+28

A(2)=54\ in^2 ----> verified

therefore

The trinomial represent the total area of the second rectangle

7 0
3 years ago
A plane ride lasted 6.4 hours. how many seconds did the plane ride last
ladessa [460]

1 * 60 * 60 = 3600 (seconds in 1 hour)

3600 * 6 = 21600 (seconds in 6 hours)

3600 * 0.4 = 1440 (seconds in 0.4 hour)

21600 + 1440 = 23040 (6 hours + 0.4 hours)

your answer is 23040

8 0
3 years ago
How many terms will the following expression have once it is simplified?
MA_775_DIABLO [31]

Answer:

B


Step-by-step explanation:

<em>Let's multiply this out and combine like terms:</em>

3x(x+1)+x\\=3x^2+3x+x\\=3x^2+4x


So there are 2 terms.

Answer choice B is right.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Write an expression that represent the sum of r and 7
    8·1 answer
  • Someone help I don’t understand this question
    7·1 answer
  • What is the value of the function y = 0.5x – 10 when x = 9?
    13·2 answers
  • Math please help now fast
    9·1 answer
  • What is the equation of the circle with center (-3.2,2.1) and radius 4.3?
    10·2 answers
  • Is -0.85 greater less than or equal to -0.98
    5·1 answer
  • What is the slope of the line ?
    14·1 answer
  • A shoe store uses a 60​% markup for all of the shoes it sells. What would be the selling price of a pair of shoes that has a who
    5·1 answer
  • 8,487 divided by 8 I need help !
    15·1 answer
  • Please answer..............
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!