A sample has a half-life of 1000 years. 1/2 of the isotopes are parents. How old is it?

a) 500 years

b) 1000 years

c) 2000 years

d) 4000 years

Answers

Answer 1
The correct answer is A
Answer 2
The answer is A you just divide the numbers

Related Questions

Please this is due in 1 hr and8 minutes...

Please don’t answer this with one answer, blank or ridiculous answer this is serious....

Answers

Answer:

Side XY is 6 units

Step-by-step explanation:

The order of ∆ QRS will be the same as the order of ∆ XYZ and the corresponding order between the 2 are congruent.

Angle Q is congruent to angle X because they are listed first. Angle R is congruent to angle Y because they are listed second. Angle S is congruent to angle Z because they are listed third.

We can see that side QR is 6 units. The corresponding side on triangle XYZ is side XY.

2x+6y=21 and -2x+3y=24 using the elimination method and write as an ordered pair

Answers

Answer:

(-0.5,7.66)

Step-by-step explanation:

2x+6y=21

-2x+3y=24

so 3y=24+2x

reduce

y=(24+2x)/3

substitute for y

2x+6(24+2x/3)=21

2x+(72+12x)/3=21

2x+24+4x=21

6x=-3

x=-0.5

y=(24+-1)/3=7.66

please help! due in 1 hour!​

Answers

I don’t know I hope you do well tho<3

Evaluate (y - 9) + (3 + x), when y = 15 and x = 5​

Answers

Answer:

14

Step-by-step explanation:

It says 'Evaluate (y - 9) + (3 + x), when y = 15 and x = 5​'.

So we'd put 15 in y's place. It'll look like this (15 - 9).

Then we'd put 5 in x's place. It'll look like this (3 + 5).

You subtract (15 - 9) which equals 6. And you'd add (3 +5) which equals 8. You add 6 + 8 together since those are your answer for the parentheses. Your final should be 14. Hopefully this helped!

5. The daily temperature recorded (in degree F) at a place during a week was as under:
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
35.5
30.8
27.3
32.1
23.8
29.9
Find the mean temperature.​

Answers

Answer:

29.9 °F

Step-by-step explanation:

The formular for mean is given as;

Mean = Sum of Terms / Number of terms

Number of terms = 6

Sum of terms = 35.5  + 30.8  + 27.3  + 32.1  + 23.8  + 29.9 = 179.4

Mean = 179.4 / 6 = 29.9

Simplify the inequality:
-12.4x+8x > -0.4x-5.2-2.7

Answers

Answer:

x < 1.975

Explanation:

-12.4x + 8x > -0.4x - 5.2 - 2.7

Add similar elements: -12.4x + 8x = -4.4x

-4.4x > -0.4x - 5.2 - 2.7

Subtract -5.2 - 2.7: -7.9

-4.4x > -0.4x - 7.9

Multiply both sides by 10

-4.4x · 10 > -0.4x - 7.9 · 10

Refine

-44x > -4x - 79

Add 4x to both sides

-44x + 4x > -4x - 79 + 4x

Simplify

-40x > -79

Multiply both sides by -1 (Reverse the inequality)

-40x (-1) > -79 (-1)

Simplify

40x < 79

Divide both sides by 40

40x / 40 < 79 / 40

Simplify

x < ⁷⁹⁄₄₀

Turn the fraction into a decimal

x < 1.975

what is 6 * 8/5 as a fraction​

Answers

Answer:

48/5 or in simplified version its 9 3/5

Step-by-step explanation:

Answer:

9 3/5

Step-by-step explanation:

1FAIpQLSedW9GapWiDC2a GDq7zacl2q8GRC22fKMRIPSYONQVv3r3S5A/... ☆
1-7 Word Problem...
Your answer
1 point
You are building a deck onto your house. The deck will be 5 meters long
and 8 meters meters wide. How many square CENTIMETERS will the deck
cover? Answer with numbers only (commas are okay to include).
Your answer

Answers

4,000 CM^2

first you multiply 8 by 5 to find out the square meters then you Multiply 100 because that's how many centimeters are in a meter and that equals 4,000.

Which expression is equivalent to 7(-7v - 7) - v?
-49V - 50
-50v - 49
-8V - 49
-50v - 7

Answers

Answer:

-50v - 49

Step-by-step explanation:

Just distribute you can even use a calculator

50v 49:))))(fgggggggggggy

if mia Khalifa was black what would her situation be

Answers

Answer:

i really don’t know

Step-by-step explanation:

that’s an interesting question

Answer:

i dont know but can we do rp on pad.let?

Step-by-step explanation:

1. Allen had 12 goals on the season. If he
played in 8 games, how many goals did
he average per game? Round your answer
to the nearest hundredth.
A. 0.67
B. 1.5
C. 2.3
D. 3.2
WILL MARK Brainlyest

Answers

Answer:

B. 1.5

Step-by-step explanation:

12/8 = 1.5

That’s good one I remember this question

Which equation can be represented by the model shown



please help me giving 25 points

Answers

i am almost sure it’s b

What value of y makes this true?
25 - y< 15

Answers

Answer:

Anything that is 11 or greater

Step-by-step explanation:

please make brainliest

Answer:

y is greater than 10

Step-by-step explanation:

(10, undefined)

What is the solution of this linear equation system? y = 3x-2 y-2 = x

Answers

Answer:

(2,4)

Step-by-step explanation:

Replace all occurrences of  y  with  3 x − 2  in each equation.

3x - 4 = x

y= 3x -2

Solve for  x  in the first equation.

x = 2

y = 3x - 2

Replace all occurrences of  x  with  2  in the equation.

y = 4

x= 2

The solution to the system is the complete set of ordered pairs that are valid solutions.

(2,4)

hope this helps :)


Superman needs to save Lois from the clutches of Lex Luthor. After flying for 8 seconds, he is 1692
meters from her. Then at 16 seconds he is 1284 meters from her.
How close to Lois is Superman after 29 seconds?

Answers

1692-1284 = 408 meters travelled in 8 seconds

408/8 = 51 meters per second is his rate of speed.

51 x 29 = 1479 meters

BUT he was 1284 meters away, so by traveling 1479 meters, he passed her.

1479 - 1284 = 195 meters past her.

He is 195 meters away from Lois at 29 seconds.

Now we could argue, since Superman is not a fool, he would’ve stopped at Lois. But that’s not what your math teacher is looking for ;)

Find QUS, given the following sets:
P = {b, d, f, g}
Q = {a, b, c, d]
R = {c, e, f, g}
S = {a, d, g}

Answers

Answer:

Q=(a,b,c,d)

S=(a,d,g)

QUS=(a,b,c,d,g) Union of set means all the elements in both set.

Identify the domain, range and x-intercept of the function below.

Answers

domain is the x values it spans across. look at the graph, and see if you can tell what that is.

range: the y values it spans across^

x-intercept: where does it hit the x axis? (hint: it intersects at 2 different points)

what is the mystery number 1,2,4,8,16,32

Answers

Answer:

64

2×32=64............

Division of fractions

Answers

Answer:

The first step to dividing fractions is to find the reciprocal (reverse the numerator and denominator) of the second fraction. Next, multiply the two numerators. Then, multiply the two denominators. Finally, simplify the fractions if needed.

Answer:

Dividing by fractions is just like multiplying fractions, except for one additional step. To divide any number by a fraction: First step: Find the reciprocal of the fraction. Second step: Multiply the number by the reciprocal of the fraction. Third step: Simplify the resulting fraction if possible.

Step-by-step explanation:

Hope this helps

A 15 inch string is cut. One piece is 7.2 in. Which equation shows how to find the 2nd length?
how did you get the answer i need the fast hurry please

Answers

Answer:

7.2+x=15

x=15-7.2

x=7.8

A rectangle has a length of 16 inches and the length of the diagonal is 20 inches. What is the width of the rectangle

Answers

Answer:

12 inches

Step-by-step explanation:

1. The diagonal is the hypotenuse of the right triangle.  so since we know one side length, we can figure out the other side length

1. 16^2 + x^2= 20^22. 256 + x^2=4003. x^2=1444. [tex]\sqrt{144}[/tex] = 12

What is the answer for (1-2g + 4h)•5?

Answers

Answer:

-10g +24 + 5 hope this helps

Step-by-step explanation:

1-2g+20h

You have to cancel out the factors

Can y’all help me on question 4?! I would really appreciate it have a good day!

Answers

Answer:

15:2

Step-by-step explanation:

If you take 45 / 6 you will end up with 7.5

You can't have a ratio with a fraction. So to get a whole number you multiply 7.5 by 2 to get a full number. Therefore 15:2

9514 1404 393

Answer:

  D.  Volcanic Gray

Step-by-step explanation:

The ratio of paint used is ...

   black : white = (4 gal) : (1/2 gal) = 8 : 1  . . . . . .  multiply given numbers by 2

This matches the ratio in the table for Volcanic Gray.

Multiplier method to decrease £262 by 39%

Answers

Answer:

159.82

Step-by-step explanation:

262          100              let unknown be "x"

x                61

262 x 61 = 100x

15982= 100x

15982/100 = x

x= 159.82

4x2 – 13x = 7x – 25
solve an equation with two real solutions practice

Answers

Answer:

x=2.5

Step-by-step explanation:

bring all terms to one side

[tex]4x^{2} -20x+25=0[/tex]

factor it

[tex](2x-5)^{2}=0[/tex]

2x-5=0

2x=5

x=2.5

Answer:

20/33

Step-by-step explanation:

4*2-13x=7x-25

8-13x=7x-25

(subtract 7 x's)

8-20x= -25

(subtract 8)

-20x= -33

3 Xavier sketches several designs for a math club
Concept Application
pin. The math club voted for the pin shape to
be a right triangle. Which of the following
triangles could NOT be the shape used for the
math club pin?
13
17
А
12
15
26
D
24
12

Answers

Answer:

D ...

Step-by-step explanation:

Use the Pythagorean Theorem to figure out which triangle is NOT a right triangle. Square each leg and add them together. Then, square the hypotenuse (longest side). If the sums are equal, then the triangle IS a right triangle.

Pythagorean Theorem:

a(a) + b(b) = c(c) ; a squared plus b squared equals c squared

6(6) + 24(24) =? 26(26) ; leg a =6, leg b=24, hypotenuse=26

36 + 576 =? 676 ; simplify

612 =? 676 ; is 612 equal to 676?

PLEASE HELP ME

6. Frankie graphed a quadratic function with a
vertex in Quadrant I. Which of the following
could be Frankie's function?
a. f(x) = -3x2 + 24x – 4
b. f(x) = x2 – 2x + 10
c. Both a and b
d. Neither a nor b

Answers

C.both a and b
I took the test

A bag contains tiles number 1-10. What is the probability of first selecting a PRIME number, replacing it, then selecting a number less than or equal to 3?​

Answers

Answer:

0.12 = 12% probability of first selecting a PRIME number, replacing it, then selecting a number less than or equal to 3

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

Probability of independent events:

Suppose we have two events, A and B, that are independent. The probability of both happening is given by:

[tex]P(A \cap B) = P(A) \times P(B)[/tex]

In this question:

Event A: Selecting a prime number.

Event B: Selecting a number less than or equal to 3

Probability of selecting a prime number:

Between 1 and 10, we have 4 prime numbers(2,3, 5 and 7), out of 10. So

[tex]P(A) = \frac{4}{10}[/tex]

Probability of selecting a number less than or equal to 3:

Three numbers(1,2,3) out of 10. So

[tex]P(B) = \frac{3}{10}[/tex]

Probability of both:

[tex]P(A \cap B) = P(A) \times P(B) = \frac{4}{10} \times \frac{3}{10} = \frac{12}{100} = 0.12[/tex]

0.12 = 12% probability of first selecting a PRIME number, replacing it, then selecting a number less than or equal to 3

20 characterssssssss

Answers

Draw 6 “C” pucks
And draw 8 regular pucks representing the other wins not by Colin.


A sum of money was divided bety
Mary and Dónal. Mary got of 5/8
he money and Dónal got the res
Dónal got €2:40, how much did Mary get​

Answers

Answer:

4.00

Step-by-step explanation:

each one of the eights is 80 cents. the way to figure it out was to just divide it by 3 or in a different place however many fractions you have/need.

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