how much of a radioactive kind of protactinium will be left after 28 hours if you start with 672 grams and the half-life is 7 hours?

Answers

Answer 1

Answer:

Step-by-step explanation:

672·0.5^(28/7) = 672·0.5⁴ = 42 grams


Related Questions

d.
a.
b.
12
8
Which triangles are similar?
8
3
25
(25
25
25
6
6
16
Ос
od
Оа
O
b

Answers

Answer:

C and d

Step-by-step explanation:

C and d are similar triangles. I think that’s what you mean. I just did the test

Pomóżcie potrzebne jak najszybciej się da proszę

Answers

Answer:

can you please write it in english

Tasha has foam blocks stored in a box that measures 314 ft long by 3 ft wide by 1 ft tall.

Each foam block is a cube with 14 -ft edge length.



How many blocks can fit into the box?




156 blocks

312 blocks

624 blocks

2496 blocks

Answers

Answer:

624

Step-by-step explanation:

I hope it helps i did the test  btw <3

Answer:

624

Step-by-step explanation:

I also did that same exact test. K12 right? That is what I go to. Anyway that answer is correct. Your welcome!

HELP DUE IN 8 MINUTES ​

Answers

im not really sure but i think it might be a or b

find ratio of 120 :80​

Answers

120 : 80

= 12 : 8

= 6 : 4

= 3 : 2

This is the answer

Answer:

120/10=12

80/10=8

12/4=3

8/4=2

Nothing can further decide, then we have

3:2

is this graph a function ​

Answers

Answer: yes because it if u plug in x values u get y values

Which graph is a parabola?



THE ANSWER IS SHOWN IN THE PICTURE

Answers

Answer:

3rd one :D

Step-by-step explanation:

  °   •  .°•    ✯

   ★ *     °      °·                            

.   • ° ★ •  ☄

▁▂▃▄▅▆▇▇▆▅▄▃▁▂

the answer is choice 3

GHIJK ~ STUVR. What is mZV?
R
G
1020
V
H
1220
K
1020
960
S
1229
126
T
m2 =
o
Submit

Answers

the answer is h 1220

solve for a, 1/3 + a = 5/4

Answers

Answer:

[tex]a = \frac{11}{12}[/tex]

Step-by-step explanation:

[tex]a = \frac{5}{4} - \frac{1}{3}[/tex]

[tex]a = \frac{11}{12}[/tex]

Answer:

[tex] \frac{1}{3} + a = \frac{5}{4} [/tex]

[tex]a = \frac{5}{4} - \frac{1}{3} [/tex]

[tex]a = \frac{15 - 4}{12} [/tex]

[tex]a = \frac{11}{12} [/tex]

Find the base of a triagnle with a
height of 12 and an area of 192
square units.

Answers

Answer:

B(ase) = 32 square units.

Answer:

32

Step-by-step explanation:

Using the formula, a = h(b)/2

192 = 12b/2

good luck, i hope this helps :)

Consider the question of whether the home team wins more than half of its games in the National Basketball Association. Suppose that you study a simple random sample of 80 professional basketball games and find that 52 of them are won by the home team. Assuming that there is no home court advantage and that the home team therefore wins 50% of its games in the long run, determine the probability that the home team would win 65% or more of its games in a simple random sample of 80 games

Answers

Answer:

0.0037 = 0.37% probability that the home team would win 65% or more of its games in a simple random sample of 80 games

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean [tex]\mu = p[/tex] and standard deviation [tex]s = \sqrt{\frac{p(1-p)}{n}}[/tex]

The home team therefore wins 50% of its games

This means that [tex]p = 0.5[/tex]

Determine the probability that the home team would win 65% or more of its games in a simple random sample of 80 games

Sample of 80 means that [tex]n = 80[/tex] and, by the Central Limit Theorem:

[tex]\mu = p = 0.65[/tex]

[tex]s = \sqrt{\frac{p(1-p)}{n}} = \sqrt{\frac{0.5*0.5}{80}} = 0.0559[/tex]

This probability is 1 subtracted by the pvalue of Z when X = 0.65. So

[tex]Z = \frac{X - \mu}{\sigma}[/tex]

By the Central Limit Theorem

[tex]Z = \frac{X - \mu}{s}[/tex]

[tex]Z = \frac{0.65 - 0.5}{0.0559}[/tex]

[tex]Z = 2.68[/tex]

[tex]Z = 2.68[/tex] has a pvalue of 0.9963

1 - 0.9963 = 0.0037

0.0037 = 0.37% probability that the home team would win 65% or more of its games in a simple random sample of 80 games

7/8 x 1/3

please help me :)

Answers

Answer: 7/24

Step-by-step explanation:

Answer:

7/24 or about 0.29

Step-by-step explanation:

when multiplying fractions you first have to remember that:

a/b * c/d = a*c / b*d

If you remember that then its not hard to calculate:

7/8 * 1/3 = 7*1 / 8*3 = 7/24

Hope i could help :D

Dont be afraid to ask questions :)

piete)
Decide whether the following statement makes sense or does not make sense. Explain your reasoning.
I drove at a speed of 35 miles for the entire trip.

Answers

Answer:

It doesn't make sense

Step-by-step explanation:

Given

Statement: .... at a speed of 35 miles .....

Required

Does it make sense?

In motion, speed is measured in km/h, m/s, miles per hour (depending on context) while distance is measured in km, m or miles.

However, the given statement mention the unit of speed to be miles which is incorrect.

Hence, we can conclude that the statement does not make sense.

A correct statement would be: I drove at a speed of 35 miles per hour .......

Factor Completely;;;;;​

Answers

Answer:

2x²-24x+54

2(x²-12x+27)

2(x²-9x-3x+27)

2(x(x-9)-3(x-9))

2(x-9)(x-3)

4/5 - 2/3 =
Find equivalent fractions and rewrite the problem and solve

Answers

Answer:

1001/1500

Step-by-step explanation:

The easiest method for doing this is to just average the two numbers.

e.g. to find a number x between the two numbers ab and cd

x=12[ab+cd]

=12[adbd+bcbd]

=ad+bc2bd

In this case…

x=(2×5)+(3×4)2×2×5=10+1230=2230=1115

You can easily see where that came from.

23=1015 and 45=1215

and the ‘common denominator’ means you just have to pick a value between 10 and 12 . i.e. 11

But you can also say…

23=100150 and 45=120150

and choose any of 101150,102150,...,119150

or

23=10001500 and 45=12001500

and choose any of 10011500,10021500,...,11991500

Answer:4/5 and 2/3 each have a common bottom of 15 so 4/5 is

12/15 and 2/3 will be 10/15

Step-by-step explanation:So than 12/15 forget the bottom don't subtract the bottom just look at it like [12-10] then you got 2 then you go back to the bottom and put it together so your answer is [2/15]

I need help fast i apperciate

Answers

Answer:

Option d is the correct answer.

Step-by-step explanation:

tan A = 24/7

Answer:

d.) [tex]\frac{24}{7}[/tex]

Step-by-step explanation:

using the sohcahtoa method, where tan A = [tex]\frac{opposite}{adjacent}[/tex], our opposite side is 24, and our adjacent side is 7. our hypotenuse, the longest side, is 25. therefore, we get: d.) 24/7

which statement is true about the graphed lines

Answers

there both liner and parallel

what number is 0.001 less than 1,000.1​

Answers

Answer:

Its Smaller by 100, because 0.001 times 100 = 0.1

Step-by-step explanation:

Answer:

I believe the answer is 1000.099

Step-by-step explanation:

I believe all you need to do is subtract 1,000.1 - 0.001 which equals 1000.099.

To help plan the number of meals to be prepared in a college cafeteria, a survey was conducted, and the following data were obtained.
132 students ate breakfast.
183 students ate lunch.
273 students ate dinner.
69 students ate breakfast and lunch.
113 students ate breakfast and dinner.
95 students ate lunch and dinner.
55 students ate all three meals.
How many students ate
(a) At least one meal in the cafeteria?
students

(b) Exactly one meal in the cafeteria?
students

(c) Only dinner in the cafeteria?
students

(d) Exactly two meals in the cafeteria?
students

Answers

Answer:

920 Students

Step-by-step explanation:

Add all of the meals together

Please dont judge me if i get this wrong this is why i joined brainly i don´t know nothing

Make a conjecture. What properties do you think stay the same after a translation? Check all that Apply.

Angle measures

Length

Orientation

Shape

Size ​

Answers

Answer: ALL OF THE ABOVE

Step-by-step explanation:

a translation doesn't change any of the above, they all remain the same. it's a trick question :P

Use the graph f(x)=x^3 to graph h(x)=1/2(x-3)^2-2

Answers

can u take a picture of it

Which pair of numbers is opposite?
Select all that apply.
|-6| and -6
|-6| and 6
6 and 1/6
6 and -6
0 and 6

Answers

A,b,d,e because c is still going to be the same even in fraction form and with a one

Answer:

Step-by-step explanation:

A,b,d,e

please help !!!!!
What is the slope of the line shown in the graph?

A. -3/2
B. -1/2
C. 3/2

Answers

Answer:

-3/2

Step-by-step explanation:

Answer:

The slope of the line shown is -3/2.

Step-by-step explanation:

You can find this by using the rise/run method between the two points.

Between the two points, the line falls 3 units down (this is the rise part) and goes 2 units to the right (this is the run part). Since the line falls 3 units down between the two points, this number would be -3, and since it runs to the right by two units, the slope can be identified as -3/2.

The human heart beats an average of 4,320 times an hour. At this rate, about how many times will a person's heart beat in one full day?

Answers

103,680

[tex]4320 \times 24[/tex]

I used a tutor for this and the answer I was given is 17.5. Which is incorrect. I am trying to understand how to solve.​

Answers

So you need to decide if you are using cos,sin or tan

You use soh cah toa for this

You label the sides

Hypotenuse - which is the side opposite the right angle

Opposite- which is the side opposite the angle given

Adjacent - the left over side

In this case the opposite doesn’t have any values so we are going to cross it out

We are using CAH

Put this into your calculator : Cos(73)x6

Cos(73)x6 = 1.754230228

The answer is 1.8 to 1 decimal place

Answer:

A right angle is 90 degree

Step-by-step explanation:

73 -90 degrees is 17 degrees. A right angle, shown is at 90 degrees

What is 12x12x14 equal to?

Answers

Answer:

The answer is 2016.

Step-by-step explanation:

12 times 12 = 144.

144 times 14 = 2016.

I hope this helps you. Have a nice day.

Answer:

2016

Step-by-step explanation:

Hope thos helpfull to tou

What percent of 94 is 23?

Answers

Answer:

24.5%

Step-by-step explanation:

23/94 = 0.2446

write 8z + z - 5 - 9z +2 in simplest form

Answers

You have to use PEMDAS to answer. So I believe that it is -3. Explanation the 8Z +Z is 9Z. Then it cancels out because of the -9z. So now you must and be -5+2 which is three

Factor completely.
- 3x² + 14x- 8

Answers

Answer =

= - 3x² + 14x - 8

= - 3x² + 12x + 2x - 8

= - 3x(x - 4) + 2(x - 4)

= (x - 4)(-3x + 2)

find square root of 82369 by division method step by step​

Answers

Answer:

I think this ans may help you

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