NEED HELP ASAP!!! WILL MARK BRAINLIEST!!!

A sample of 500 g of radioactive lead-210 decays to polonium-210 according to the function A(t) = 500 e ^-0.0325, where t is time in years. Find the amount of radioactive lead remaining after (a) 4 yr, (b) 8 yr, (c) 15 yr. (d) Find the half-life.

Answers

Answer 1

Answer:

t=4

Step-by-step explanation:


Related Questions

Find the common difference of the arithmetic sequence 13, 9, 5,...

Answers

Answer:

it goes down by 4 every number

whats the missing varible for the following questions ​

Answers

Answers + Explanation:

1. x + 7 =10

if you know some number + 7 is 10, you know that number must be 3.

so, x = 3

the other way you can solve this would be:

x + 7 = 10

subtract 7 from both sides of the equation

x + 7 - 7 = 10 - 7

x = 3

2. Use the same strategy:

x - 8 = -5

add 8 to both sides of the equation

x - 8 + 8 = -5 + 8

x = 3

3. x + 3 = 6

subtract 3 from both sides of the equation

x + 3 - 3 = 6 - 3

x = 3

4. x + 6 = 3

subtract 6 from both sides of the equation

x + 6 - 6 = 3 - 6

x = -3

A square has sides of length 4xcm. A rectangle is 4x by (x+6) cm. The
area of the square is triple the area of the rectangle. Find the dimensions of
each figure.​

Answers

Answer:

x = 18 cm

Step-by-step explanation:

(4x)^2 = 3(4x)(x+6)

16x^2=3(4x)(x+6)

divide both sides by 4x

4x = 3(x+6)

4x=3x+18

x = 18

Find the value of x in the triangle shown below.
10.4
62°
12
12

Answers

Two of the sides are the same (12) so the two angles at the top will also be the same, so you have two angles that are 62.

62 + 62 = 124

The three angles of a triangle need to equal 180.

X = 180-124 = 56

The answer is x = 56

Solve the inequality 7(x+2)-5>3(x-1)

Answers

Answer:

x>-3

Step-by-step explanation:

I used a calculator

In ΔKLM, the measure of ∠M=90°, the measure of ∠L=75°, and MK = 54 feet. Find the length of LM to the nearest tenth of a foot.

Answers

Answer:

14.5 feet

Step-by-step explanation:


Select the correct answer
A fair, unbiased coin was flipped 10 times, giving the results shown in the table, where Ttails and heads.

What is the difference between the theoretical and experimental probabilities of getting heads?
please help ill mark you the brainlyest!!!!

Answers

Answer: The answer is most likely 0.3

Step-by-step explanation:

The difference between the theoretical and experimental probabilities of getting heads is 0.3.

This question is solved using the concepts of theoretical and experimental probabilities.

Theoretical probability: Calculated without considering previous trials. Experimental probability: Calculated considering previous trials.

----------------------------

Theoretical probability:

A fair coin means that it is equally as likely to be heads or tails, so 0.5 theoretical probability of getting heads.

----------------------------

Experimental probability:

Out of 10 trials, 2 resulted in heads, so 2/10 = 0.2 experimental probability of  getting heads.

----------------------------

Difference:

0.5 - 0.2 = 0.3

The difference between the theoretical and experimental probabilities of getting heads is 0.3.

A similar question is found here: https://brainly.com/question/23995602

PLS ANSWER ASAP!!!!! Which scatterplot suggests a linear relationship between x and y?
A) I only
B) I and IV only
C) I, II, and IV only
D) I, III, and IV only

Answers

Answer:

i think c isthe answér of it may be it is

Answer:

I and IV only

Step-by-step explanation:

I and IV only -- suggest a linear relationship between x and y.

A linear relationship has a line of best fit that can be drawn where most points are associated with the line.

Mr. McMurray wants to buy a new car. Last year the sticker price on the model he wanted was $12,800. This year the price is $14,720. By what percent did the price increase during the past year?

Answers

Answer:

15% increase

Step-by-step explanation:

It increases by $1920 which is 15%

HELP ASAP

Work out

137% of 720.11kg

Give your answer rounded to 2 DP.

Answers

Answer:

The answer is 986.55 kg.

Step-by-step explanation:

When asked to find 137% of 720.11 kg, we can take the percentage, 137%, and convert it into a decimal by moving the decimal point over to the left twice.

137% = 1.37

After converting the percentage to a decimal point, we can multiply the original given value by the decimal.

720.11 kg x 1.37 = 986.5507 kg

And then we round to the nearest hundredths place, which will give us 986.55 kg.

The required evaluation of 137% of 720.11 kg would be 986.55 kg.

What is the percentage?

The percentage is defined as a ratio expressed as a fraction of 100.

We have to determine the evaluation of 137% of 720.11 kg.

⇒ 137% of 720.11

137%  is expressed as 15/100 in fractional form

⇒ (137/100)(720.11 )

137/100  is expressed as 0.95 in decimal form

⇒ (1.37)(720.11 )

Apply the multiplication operation, and we get

⇒ 986.55

Therefore, 137% of 720.11 kg would be 986.55 kg.

Learn more about the percentages here:

brainly.com/question/24159063

#SPJ2

I need help yall. Brainliest for the first person who actually shows their work.
30 pts btw
just solve one of them, so ik how to do the rest

Answers

73 degrees. Ur welcome

Help please I’m not good in msth

Answers

Answer:

Q ' (3,4)

Step-by-step explanation:

When we reflect across the x axis, the y coordinate becomes -y

Q (3,-4) becomes Q' (3,- -4)

                             Q ' (3,4)

Lines s and t are parallel. The slope of line s is −3/2 . What is the slope of line t ?

Answers

Parallel lines have the same slopes.

So if line s has a slope of -3/2, line t also has a slope of -3/2.

can someone solve this
19 + (-60)

Answers

Answer:

-41

Step-by-step explanation:

Answer:

-41

if you add a negitive it's like you're subtracting it

Learning Task 3
Solve the word problems
1. The sides of the quadrilateral are consecutive numbers. If the perimeter is 160,
how long is each side?
2. Inzo is 10 years older than Migz. Five years ago Migs is one-third as old as
Inzo. What are their present ages?
3. An express train travels 100 kph from station A to station B. A local train
travelling at 45 kph, takes 45 minutes longer for the same trip. How far apart
is station A from station B.
4. The sum of two consecutive even integers is less than 60 but greater than 24
Find at least 3 pairs of numbers
5. The perimeter of the square is less than 152 m. Find the possible length of t
sides of the square.​

Answers

Answer:

Step-by-step explanation:

Conflict is

a.

the deliberate attempt to control a person by force, to oppose someone, or to harm another person.

b.

when two or more people or groups work together to achieve a goal that will benefit more than one person.

c.

a state of balance between cooperation and conflict.

d.

the division of labor.Conflict is

a.

the deliberate attempt to control a person by force, to oppose someone, or to harm another person.

b.

when two or more people or groups work together to achieve a goal that will benefit more than one person.

c.

a state of balance between cooperation and conflict.

d.

the division of labor.Conflict is

a.

the deliberate attempt to control a person by force, to oppose someone, or to harm another person.

b.

when two or more people or groups work together to achieve a goal that will benefit more than one person.

c.

a state of balance between cooperation and conflict.

d.

the division of labor.Conflict is

a.

the deliberate attempt to control a person by force, to oppose someone, or to harm another person.

b.

when two or more people or groups work together to achieve a goal that will benefit more than one person.

c.

a state of balance between cooperation and conflict.

d.

the division of labor.Conflict is

a.

the deliberate attempt to control a person by force, to oppose someone, or to harm another person.

b.

when two or more people or groups work together to achieve a goal that will benefit more than one person.

c.

a state of balance between cooperation and conflict.

d.

the division of labor.Conflict is

a.

the deliberate attempt to control a person by force, to oppose someone, or to harm another person.

b.

when two or more people or groups work together to achieve a goal that will benefit more than one person.

c.

a state of balance between cooperation and conflict.

d.

the division of labor.Conflict is

a.

the deliberate attempt to control a person by force, to oppose someone, or to harm another person.

b.

when two or more people or groups work together to achieve a goal that will benefit more than one person.

c.

a state of balance between cooperation and conflict.

d.

the division of labor.

l=prt
you have to solve for t

Answers

Answer:

T is equal to I divided by pr. [tex]t=\frac{I}{pr}[/tex]

Step-by-step explanation:

This is the equation for interest.

I is interest.

P is the principal

r is the interest rate

t is the time in years

you have to isolate for t.

Because multiply p times r times t, divide both sides by pr due to the fact that division is the inverse operation of multiplication

Then you are left with t= i divided by pr.

hope this helps

Write 0.4% as a fraction or mixed number in simplest form.

Answers

Answer:

4/1000

Step-by-step explanation:

Write an exponential function whose graph passes through the points (0,-2) and (2,-50)

Answers

Answer:

first sub in (0,-2) to get

-2 = ab^0, but b^0 = 1

so a=-2

so far we have

y = -2b^x

now use the other point (2,-50)

-50 = -2(b^2)

b^2 = 25

b= ±5

however in exponentional equations the base is usually positve, so now you have

y = -2(5^x)

sub in x=-2 and you got it.

Step-by-step explanation:

hope it helps..

how do scale drawings and actual measurements represent proportional relationship​

Answers

Answer:

Step-by-step explanation:

For exapmple: scale is 1:2 on a map

1 cm on the map is 2 cm in real life.

1 m on the map is 2 m in real life.

the proportion on the map is multiplied by the second number on the scale

Write the value with positive exponent (1/2)-4

pls answer fast pls ​

Answers

Answer:

wow no sabría como ayudarte

PLS HELP. CIRCUMFERENCE QUESTION! WILL GIVE BRAINLIEST

Answers

Answer:

L = 24,873.6 miles

Step-by-step explanation:

Length of the Circumference

Given a circle of radius r, the length of the circumference, or line surrounding the shape is:

The Earth has a diameter of 7,917.5 miles. The radius is half the diameter:

r=7,917.5/2=3,958.75 miles

Assuming a plane flies around the equator at ground level, the distance it would travel is:

L = 24,873.6 miles

Two county fairs are nearby, and Marc is trying to determine which one would be best to attend. Both fairs sell tickets for rides, food, games and more. Polk County Fair is charging a $10 entry fee, and each ticket costs $2.50. Pinellas County Fair isn't charging an entry fee, but each ticket costs $3.

Answers

Answer:

Step-by-step explanation:

It depends on how many tickets Marc will need.

For t tickets, Polk costs 10+2.5t and Pinellas costs 3t.

10+2.5t = 3t

t = 20

If Marc needs fewer than 20 tickets, Pinellas is the more economical choice.

evaluate bc + 5a
when a = 3, b = 4, and c = -6

Answers

Evaluation by bc+5a when a is 3 and b is 4 and c is -6 it is 51

Answer:

-15

Step-by-step explanation:

if b= 4 and c=-6 it would be 5 times -6 which equals to -30. since this equation needs to be done with pemdas you dont add just yet. then you go and multiply 5 times 3 which is 15. and then you can add both totals you got which would be 15 + -30.

I only have a few minutes. Help? 40 points

Answers

Step-by-step explanation:

<R and <T are vertical angles.

<U and. <Z are corresponding angles.

<S and <Z are alternate exterior angles.

<T and <W are alternate interior angles.

Hope it will help :)

Hi! Is there anyone good with finding the surface area of something? If so, please comment. If you do help me, I will give you 5 star every time you help.

Answers

No sorry 123
God bless you

common denominator for 3/5 and 1/2

Answers

Answer: 10

Step-by-step explanation:

To find a common denominator, simply multiply the denominator and numerator of one fraction by the denominator and numerator of the other.  Then repeat.

3*2/5*2 = 6/10

1*5/2*5=5/10

As you can see, the denominator of both fractions is 10.

Hope it helps and lmk if you need further explanation :)

How do you solve this ANSWER QUICK!!!

Answers

3.07 x 9.4 = 28.858

So 8.2 x 7.98 = 65.436

2.8 x 0.05 = 1.40

6.25 x 10.0 = 62.50

Answer:

3.07 x 9.4 = 28.858

8.2 x 7.98 = 65.436

2.8 x 0.05 = 0.14 (put the zero in too it's important

6.25 x 10.4 = 65

The Code:

8415

I think

Simplify the expression: (3 − 7i)(2 − 5i)

Answers

Answer:

( 3 -  7i) • ( 2 -  5i) = ( -  29 -  29i)

Step-by-step explanation:

The formula is :

(a+bi) • (x+yi)  = ax+by•i^2+(ay+bx)i

and since  i^2 = -1  it can be written as :

ax - by + (ay + bx) i

( 3 -  7i) • ( 2 -  5i) =

 ( -  29 -  29i)

Answer:

—29 - —29i

Step-by-step explanation:

A diagram of a swimming
pool is below. The width of
the pool is 25 m, find the
length of the actual pool?
7.5 cm
15 cm

Answers

the correct answer is 50


7.5×2 = 15

25×2 = 50

Identify whether the following numbers are rational or irrational i) 0.11011001100011...........
ii) 2.56565656...........

Answers

Answer:

i) is irrational and ii) is rational

Step-by-step explanation:

i) does not keep a consistent pattern. If it was .11011011011.... it would be a rational number, but since it keeps changing its pattern it would be considered irrational. ii) is rational because it has a consistent pattern that doesn't change.

Step-by-step explanation:

0.11011001100011...............is your answer right answer

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