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
Paraphin [41]
3 years ago
13

40 points plzzz Help!!! Radium has a half-life of 1600 years. How much radium will be left from a 1000-gram sample after 1600 ye

ars?
Mathematics
2 answers:
DochEvi [55]3 years ago
7 0
This is a pretty easy half life problaem.
There are formulas for calculating this using "e" but I have a simpler formula which you can find here:
http://www.1728.org/halflife.htm

Ending Amt = Beginning amount / 2^n
where n is the number of half-lives
n = 1
Ending Amt = Beginning amount / 2^1
Ending Amt = 1,000 / 2
Ending Amt = 500 grams

umka2103 [35]3 years ago
4 0

Answer:

Ending Amount = Beginning amount / 2^1

Ending Amount = 1,000 / 2

Ending Amount = 500 grams

Step-by-step explanation:

You might be interested in
Create the equation of a line that perpendicular to 2y=14+2/3x and passes through the point (-2,8).
riadik2000 [5.3K]

Answer:

y = - 3x + 2

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Rearrange 2y = 14 + \frac{2}{3} x into this form

Divide all terms by 2

y = 7 + \frac{1}{3} x ← in slope- intercept form

with slope m = \frac{1}{3}

Given a line with slope m then the slope of a line perpendicular to it is

m_{perpendicular} = - \frac{1}{m} = - \frac{1}{\frac{1}{3} } = - 3, hence

y = - 3x + c ← is the partial equation of the perpendicular line

To find c substitute (- 2, 8) into the partial equation

8 = 6 + c ⇒ c = 8 - 6 = 2

y = - 3x + 2 ← equation of perpendicular line

4 0
3 years ago
What is the absolute value of -25?
NISA [10]

Answer:

25

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
What percent is equal to 7/25​
ella [17]
28% because 25x4=100 7x4=28
8 0
3 years ago
In a dance competition, a participant has to score a total of at least 30 points in the first four rounds combined to move on to
77julia77 [94]
<span>So Steward scored 5 for the first round, that will be our constant. There is 3 more rounds for him to score at least 30. at least tells us this is a greater than or equal to 5+3p<30</span>

3 0
3 years ago
Based on the tax brackets, what’s the estimated total tax due for a single taxpayer with a taxable income of $43,500?
inysia [295]

Answer:

C. $5,509.50

Step-by-step explanation:

The computation of the estimated total tax due in case of taxable income for $43,500 is shown below:

Since in the question the income brackets and based on the income the different tax is to be charged

For $9,525, the 10% tax is charged i.e

= \$9,525 \times 10\%

= $952.50

Upto $38,700, the 12% tax is charged i.e

= (\$38,700 - \$9,526) \times 12\%

= $3,500.88

The remaining amount left is

= (\$43,500 - \$38,701) \times 22\%

= $1,055.78

Now the total tax due is

= $952.50 + $3,500.88 + $1,055.78

= $5,509.16 approx i.e $5,509.50

6 0
4 years ago
Other questions:
  • To the nearest thousand what was E (X) expected number of bases for Alex Rodriguez in a typical at bat in 2007
    10·1 answer
  • What is the midpoint of EC ?
    9·1 answer
  • Help and I'll help back
    11·1 answer
  • A professor at a local university noted that the grades of her students were normally distributed with a mean of 78 and a standa
    14·1 answer
  • PLZ HELP! MATH
    10·2 answers
  • What's the equation?
    5·1 answer
  • The sum of the first 3 terms of a geometric series is 171 and the common ratio is 2/3
    12·1 answer
  • How do I solve this and what’s the answer? This is due at 11:59 pm on 2/9/21 PLEASE HELP!
    8·1 answer
  • Line I is shown in the coordinate plane.<br> Is the point (16, 20) on line l ?
    13·1 answer
  • Which of the following are equivalent to the expression 9/4 ( 1.75 - 2 1/4)? Select all that apply.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!