the half life of radium is 1690 years. if 100 grams are present now, when will there be 20% of the original amount​

Answers

Answer 1
Let A=the remaining amount of radium
Let S=the amount of radium you start with
Let t=the amount of time in years
Let h=the half-life time

Then A=S(1/2)^(t/h)
So,
A=80(1/2)^(430/1690)
A=approx. 67g

Related Questions

Find the values of X and Y

Answers

Answer:

x=90, angle bisector theorem

y=43,

90+47+y=180

=137+y=180

y=43

Helppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp

Answers

Answer:

2. -1/3x > 12

3. 5+x > 7

4.10-x < 30

5. 2+5x ≤ 3

6.6-2x ≥ 17

Step-by-step explanation:

How many 8ths of an inch are there in 3/4

Answers

Answer:One-half names the same number as two-quarter or as three sixths  or as four-eights . Three-fourths  is equal to six-eighths because they are different ways of expressing the same number.

Step-by-step explanation:

An order is written for 1200 adult weight 164 pounds and is 5/9 all with a BSA of 1.9 m to the physician ordered o n c o v i n 2 mg / M2 for chemotherapy treatment of a malignant tumor. Oncovin is supplied as 1 mg/ml. What volume should the patient receive per dose?

Answers

Answer:

The volume per dose that the patient should receive is 3.8 ml

Step-by-step explanation:

The physician ordered oncovin 2 mg/m² for chemotherapy treatment of a malignant tumor.

The adult's BSA (Body surface area) = 1.9m²

Hence, the amount of oncovin needed based on his body weight is:

2mg/1 m² = x mg/1.9m²

Cross Multiply

x mg = 2mg × 1.9

x = 3.8mg

We are told , oncovin is supplied:1 mg/ml

Hence:

This means

1 mg = 1 ml

3.8 mg = x ml

Cross Multiply

x ml = 3.8 ml

The volume per dose that the patient should receive is 3.8 ml

A family restaurant chain wants to test the market for a new menu item: a grilled chicken sandwich with chipotle salsa. They are interested in both how to market the item and the right price to charge for it. They decide to offer the sandwich at 60 different restaurants in the chain, using two different descriptions on the menu. Half the restaurants' menus will emphasize "healthy eating" and half will emphasize "value." These two groups of restaurants will be further divided in three groups, each charging either a High, Medium, or Low price for the sandwich. After a month, they will measure what proportion of customers order the new sandwich.

Answers

Answer:

Experimental units, factors & treatments in experiment.

Step-by-step explanation:

Experimental Units are the 60 restaurants.

Factors are the : Menu description & price

Treatments in experimental design : Healthy Low Price, Healthy Medium Price, Healthy High price & Value low price, Value medium price, Value high price.

How would I solve this? I tried and I got a reallly crazy number... I think I messed up somewhere. The question is... Jack and Mark work together on a job, but not equal hours. Mark gets paid $11 per hour and Jack gets paid $10 per hour. Together they worked 58 hours and earn a total of $601. How many hours did each one work?

I made these equations.
m+j=58
11m+10j
The first one I rearranged to m=58-j.

Answers

37 x 10 = 370
21 x 11 = 231

Mark worked 21 Hours, Jack worked 37 Hours.

Answer:

Jack earns $37

Mark earns $21

Step-by-step explanation:

m + j = 58

11m + 10j = 601

j = 58 - m

11m + 10(58 - m) = 601

11m + 580 - 10m = 601

1m = 601 - 580

m = 21

j = 58 - m

j = 58 - 21

j = 37

Simplify.
2x^2−3xy+4y^2

Answers

it’s simplified as far as it can be. it’s not factorable either

Meryl planted 270 plants in 45 equal rows. Find the unit rate.

Answers

Answer:

6 plants per row

Step-by-step explanation:

270 divided by 45 gives you 6, which is your individual value per row

Answer:

6 plants per row

Step-by-step explanation:

This is a fraction equal to

270 Plants ÷ 45 Rows

We want a unit rate where

1 is in the denominator,

so we divide top and bottom by 45

270 Plants ÷ 45

45 Rows ÷ 45

=

6 Plants

1 Row

=

6 Plants

Row

= 6 Plants per Row

simplify
3x+6y+5y-2y

please explain i need help :(

Answers

3x+6y+5y-2y

Combine like terms

3x+9y

Answer=3x+9y

what is the square root of 625

Answers

Answer:

25

Step-by-step explanation:

25 times 25 =625

Answer:

25

Step-by-step explanation:

for questions like these it is best to use a calculator

if you use a TI 84 calculator then press the blue button that says "2nd" and

then on that same column there will be a button that says [tex]x^{2}[/tex]

press these buttons then enter the number that you want to find the square root of

then press "enter" and your answer will be there

Which geometric series converges?
A. 1/5 + 2/5 + 4/5 + 8/5 +...
B. 1/5 + 6/5 + 36/5 + 216/5 +...
C. 1/5 + 2 + 20 + 200 +...
D. 1/5 + 1/20 + 1/80 + 1/320 +...

Answers

Answer:

D. 1/5 + 1/20 + 1/80 + 1/320

Step-by-step explanation: i got you bro

Answer:

answer is D

Step-by-step explanation:

Will give the brainiest!!
The graph below shows a line segment XY:

HERE ARE THE MULTIPLE CHOICE ANSWERS: What is the slope of the line segment XY?

−2
− 1 over 2
1 over 2
2

Answers

-2. The slope of a function is measured by rise over run. The rise from one point to another is 2 but the run goes towards the left 1 meaning it is negative. 2/-1=-2

Which situation can the integer -4 ​represent?
Choose the correct answer below.
(A.) walking up 4 stairs
(B.) earning 4 dollars
(C.) gaining 4 yards
(D.) Walking down 4 stairs

Answers

Answer:

D

Step-by-step explanation:

because it's going down by 4 not going up so it would represent -4

Eeeeeeeeeeeeeeeeeeeeeee

Answers

It would b because p = -6 and q = the opposite which is 6.

Which of the following DOES NOT equal 8%?

A.)0.08
B.)0.08
C.)8/100
D.)8.0%
E.)8.0%
F.)2/25
G.)4/5

Answers

Answer:

g

Step-by-step explanation:

8/100 is the same as 0.08 and 8,0% doesn't change and 2/25 is 8% as 1/25 is 4 so 2 would be 8 and it is g as 4/5 is 80%

PLEASE MAY I HAVE BRAINLIEST

The drama club has $4000 to spend on their winter performance. They have already
spent $1500 on the set, and programs cost $1.75 each.
Thetinequality 1500 + 1.75x<=4000 can be used to determine the number
of programs, x, that can be ordered. Which statement about the number of
programs that can be ordered is true?

The drama club can purchase at least 1.428 programs

The drama club can purchase at most 1.428 programs

The drama club can purchase 1,429 programs

The drama club can purchase 4000 programs

Answers

Answer:

The drama club can purchase 1429 programs

Step-by-step explanation:

A building is 50 feet tall and casts a 25 foot shadow. If Mark is 6 feet tall, how long would
his shadow be?

Answers

Answer:

Mark's shadow would be 3 feet.

Step-by-step explanation:

If a building is 50 feet tall and casts a 25 foot shadow, then the shadow of an object is 1/2 the length of the actual object.

This can be supported by the division problem:

50 ÷ 2 = 25

If Mark is 6 feet tall, then we need to divide 6 by 2 in order to find the length of the shadow.

6 ÷ 2 = 3

Therefore, Mark's shadow would be 3 feet.

Hope this helps! :D

mark’s shadow would be 3 feet because if the building is 50 feet tall & the shadow is 25 feet, it’s divided in half so his shadow is going to be 3 feet tall since he is 6

16 Four biased coins, A, B, C and D are thrown.
The probability that each coin will land on Heads is shown in the table.
Coin
Probability
A
0.33
B
0.033
1
С
3
D
30%

i) which coin is least likely to land on Heads?

ii) Which coin is most likely to land on Heads?

Julie says ,

"The probability that coin C will land on Heads is the same as the probability that coin C will land on Tails."

b) Is she correct?
Give a reason for your answer.

Coin B is going to be thrown 4000 times

c) work out an estimate for the number of times coin B will land on Heads.

and also please give me step by step thanks x

Answers

Answer:

Step-by-step explanation:

There are no results for ADD YOUR ANSWERQuestion16 Four biased coins, A, B, C and D are thrown.The probability that each coin will land on Heads is shown in the table.CoinProbabilityA0.33B0.0331С3D30%i) which coin is least likely to land on Heads?ii) Which coin is most likely to land on Heads?Julie says ,"The probability that coin C will land on Heads is the same as the probability that coin C will land on Tails."b) Is she correct?Give a reason for your answer.Coin B is going to be thrown 4000 timesc) work out an estimate for the number of times coin B will land on Heads.and also please give me step by step thanks x​

Check your spelling or try different keywords

5-x< 13
Idk what it si

Answers

Answer:

Step-by-step explanation:

5-x< 13

-5      -5

-x< 8

Answer:

-8

Step-by-step explanation:

5-x<13

-x<13-5

-x<8

-x/-1<8/-1

x<-8

What is the approximate area of the circle shown below?
A. 94 cm2
B. 11,310 cm2
C. 2827 cm2
D. 188 cm2

Please help

Answers

Answer:

Step-by-step explanation:

we have the diameter =60 cm, the radius is 60/2=30 cm

A circle is 3.14*r^2=2827 cm^2

Answer: C. 2827 cm2

Step-by-step explanation:

The area of a circle is calculated by pir^2; r = the radius

In the diagram, the diameter is provided. The radius is half of the diameter. 60/2 = 30, so the radius is 30 cm.

Plug these values into the formula

A = 3.14*30^2

A = 2827.43, which would round to 2827 cm2

PLS HELP ASAP

What is the value of X?
The answer is 8 but I need to show the work pls help

Answers

Answer:

x = 8

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Equality Properties

Geometry

All angles in a triangle add up to 180°

Step-by-step explanation:

Step 1: Set up Equation

(7x - 1) + 80 + (6x - 3) = 180

Step 2: Solve for x

Combine like terms:                    13x + 76 = 180Isolate x term:                              13x = 104Isolate x:                                       x = 8

Answer: x = 8

Step-by-step explanation:

Hoped this helped

School lunches cost $224.75 for 15.5 weeks. About how much would the lunches cost per week?

Answers

$224.75 divided by 15.5 = 14.5 i used a calculator

Answer:$14.50

Step-by-step explanation:

Divide 224.75 by 15.5 and you will get the cost for per week.

The sum of two numbers is 40. One number is 4 times as large as the other. What are the numbers? Larger number: Smaller number:

Answers

Answer:

The answer is 8

Step-by-step explanation:

S×4+s=40

s×5=40

40÷5=8

Have a great day:)

The price of a ticket to a show was $18.30 after a 25% discount. What was the original price?

Answers

Answer:

24.40

Step-by-step explanation:

divide this by 3, which gets you 6.10, or 1/4 of the total, then add that onto the 18.30 and boom

What is m∠ABC?


A. m∠ABC = 60°

B. m∠ABC = 67°

C. m∠ABC = 120°

D. m∠ABC = 127°


Brainlist for the correct answer

Answers

Answer:

The answer is D I'm not sure

Answer:

127 degrees

Step-by-step explanation:

When you add up all three angles of a triangle, the sum will always be 180 degrees. Just add up the two known angles and that will equal Angle ABC because a straight line also equals 180 degrees

4x - 4 < 8 AND 9x + 5 > 23

Answers

Answer:

- infinite 3 for the first one. x<3

x>2 ....2 infinite

Type the correct answer in the box. Use numerals Instead of words. Consider the function shown on the graph. у 8 8 02 4 2 2 X -10-8 -6 0 2 N- 6 6 8 10 -2 -4 -6 -8 Complete the statements to make them true,

domain x >
range y > ​

Answers

Answer:

Domain → [-5, ∞)

Range → [-2, ∞)

Step-by-step explanation:

Domain:

Domain of a function on from its graph is represented by the set of x-values (Input values).

Range:

Range of a function is a set of y-values (output values).

From the graph attached,

Graph starts from x = -5 and tends towards the infinity, so the domain will be,

Domain → [-5, ∞)

Similarly, y-values vary from y = -2 to y = ∞

Therefore, Range → [-2, ∞)

Given the graph of the function:

Domain is: [-5, ∞)

Range is: [-2, ∞)

Domain and Range of a Function

The domain of a function are all the values of x that are plotted on the x-axis, while the corresponding y-values are the range of the function.

Thus:

From the given graph representing a function:

Domain of the function is between -5 to infinity.

Range of the function is between -2 to infinity.

Therefore, given the graph of the function:

Domain is: [-5, ∞)

Range is: [-2, ∞)

Learn more abut domain and range of function on:

https://brainly.com/question/25915612

Help pls I am in 4th and my sister is at school so she can't help pls I was sick when we learned this I need like a couple more and then I can do the rest :(

Answers

Answer:

3/20

Step-by-step explanation:

you multiply 1/4 and 2/5 to get the answer

Help me please!!!!!!!

Answers

Answer:

yes

Step-by-step explanation:

that symbol means <= which means x is less than OR equal to  5/2

Owen made exactly 72% of his free throws during the first half of the basketball season, and he made six free throws during the second half of the season. For the entire season he made exactly 60% of his free throws. What is the fewest possible number of free throws Owen could have attempted during the second half of the season?

Answers

Answer:

The fewest possible number of free throws Owen attempted is 15 throws

Step-by-step explanation:

From the first half,

72% = 72/100 = 18/25, reduced to its simplest ratio.

It means that he made at least 18 free throws in the first half of the season.

From the second half,

Let x be the fewest possible outcome of free throws, and the sum of total is 60% = 60/100 = 0.6

Considering the 6 free throws during the second half of the season,

(18+6)/(25+x) = 0.6

24/(25+x) = 0.6

Solving for x,

24 = 0.6(25+x)

24 = 15+0.6x

24-15 = 0.6x

9 = 0.6x

x = 9/0.6 = 15

x = 15 free throws

The fewest possible number of free throws Owen attempted is 15 throws

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