In a lab experiment, the decay of a radioactive isotope is being observed. At the beginning of the first day of the experiment the mass of the substance was 800 grams and mass was decreasing by 13% per day. Determine the mass of the radioactive sample at the beginning of the 12th day of the experiment. Round to the nearest tenth (if necessary).

Answers

Answer 1

Answer: The answer is that the mass would be 310.7 on the 12th day

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Which fraction converts to a terminating decimal number?a.) 1/6 b.) 2/9 c.) 3/8 d.) 4/7

Check my answers PleaseYou are going to the movie theater with your parents and your 8 year-old brother. Adult tickets cost $8, ages 10 -18 cost $7.25 and under age 10 cost $4.25. If you spent an additional $20 on soda and popcorn, what is the total cost of your trip to the movie theater?

(Points : 1)
$11.50
$20.00
$47.50
$28.50

Question 2. 2. Your parents gave you $50 to take your younger brother and sister to the movies. You ticket cost $7.25 and your siblings cost $4.25. If you spent an additional $10 on soda and popcorn, how much money did you bring home with you?
(Points : 1)
$40
$28.75
$22.50
$24.25

Question 3. 3. How much change from $90 would you receive if you bought 5 concert tickets at $16.85 each?
(Points : 1)
$5.75
$9.00
$7.10
$22.60

Question 4. 4. Marta is buying 7 tickets from Ticket Buy at $13.79 each. If the broker charges $2.50 handling per ticket and $9.00 shipping, how much is her total cost?
(Points : 1)
$96.53
$123.03
$159.53
$177.03

Question 5. 5. Tickets to the Planetarium cost $5.25 each and come in a book of 8. How much change will Kenny get from $60 if he buys a book of 8?
(Points : 1)
$18.00
$54.75
$12.00
$11.50

Question 6. 6. Jason has "buy one get one free" tickets to the comedy club. He is bringing 7 people, including himself. If the regular price is $10.25 per person, how much change will he have left from $100 bill?

(Points : 1)
$28.25
$59.00
$41.00
$71.75

Question 7. 7.
Which would cost less and by how much: you and a friend go to Theater Y and you each buy a drink/popcorn combo (tickets are 8.25 each and a drink/popcorn combo is 4.50 each), or you and your friend rent a video for $4.50 and buy a 2 liter of cola ($1.50) and a bag of microwave popcorn ($2.00) to share?
(Points : 1)
Theater Y by $17.50
Home by $17.50
Theater Y by $8.00
Home by $8.00

Question 8. 8. The Movie Fan store rents videos for $3.99 each. You can get a two week movie pass for $20 and rent unlimited movies. If you were going to rent 4 movies in the next two weeks, which is cheaper, separate rentals or the movie pass?
(Points : 1)
separate rentals
movie pass

1.c 2.d 3.a 4.b 5.a 6.c 7.b 8.a Help if you can there simple math problems but I know I got 2 wrong what ones are they??? I know because I took a quiz on them and got 2 wrong I just want to know which ones so I can retake it.

Answers

The correct answers are:
$47.50;
$24.25;
$5.75;
$123.03;
$18;
$59;
Home by $7.50; and
separate rentals.

Explanation:
For the first question:
Your family purchases 2 adult tickets at $8 each; 2*8=16. You then purchase 1 10-18 ticket for $7.25 and 1 under 10 ticket for $4.25. You then purchase $20 in soda and popcorn. This gives us a total of:

16+7.25+4.25+20=47.50.

For the second question:
You purchase your ticket for 7.25 and a ticket for each of your siblings at 4.25, which is 2*4.25=8.50. You then purchase $10 in soda and popcorn. This gives us a total of:

7.25+8.50+10=25.75.

The change will be:
50-25.75=24.25.

For the third question:
5 tickets at $16.85 each would be 5*16.85=84.25.

This gives us
90-84.25=5.75 in change.

For the fourth question:
7 tickets at $13.79 each will cost 7*13.79=96.53.

The handling for all 7 tickets, at $2.50 each, will be 7*2.50=17.50

These together with the shipping charge will be
96.53+17.50+9=$123.03.

For the fifth question:
The book of 8 tickets, which cost $5.25 each, will be 8*5.25=$42.

This will give us
60-42=$18 in change.

For the sixth question:
He has buy one get one free tickets; this means he will buy 3 tickets and get 3 free for the first 6 tickets. He will then need to buy the 7th ticket; this means he will pay for 4 tickets:
4*10.25=$41.

Out of $100, he will have
100-41=$59 in change.

For the seventh question:
The tickets at Theatre Y cost 8.25*2=16.50. Two drink/popcorn combos at the theatre will cost 4.50*2=9. Together, this is 16.50+9=25.50.

The cost of the dvd rental (4.50), soda (1.50) and popcorn (2.00) at home is 4.50+1.50+2=8. This makes staying at home the cheaper option; it is
25.50-8=$17.50 cheaper.

For the eighth question:
4 separate rentals will cost 4*3.99=$15.96. This is cheaper than $20.

What times 7 equals 56

Answers

seven times eight equals fifty six

Answer:

Step-by-step explanation:

8 multiplied/times 7 equals to 56.

Formulas: 8 x 7 = 56 | 8 * 7 = 56 | 8 · 7 = 56 |

Other Step-by-steps:

8+8+8+8+8+8+8 = 56

7+7+7+7+7+7+7+7 = 56

Hope this helps!

- HocusPocus

Which is greater 2/3 or 2/6

Answers

2/3 because 2/6 would equal 1/3

Find the common denominator

2/3--->4/6

2/6--->2/6

4/6 is greater than 2/6.

2/3 is greater than 2/6.

A spherical balloon is inflating with helium at a rate of 6464piπ StartFraction ft cubed Over min EndFraction ft3 min. How fast is the balloon's radius increasing at the instant the radius is 22 ft? How fast is the surface area increasing?

Answers

Answer:

the surface area will increase 16 feet per minute

Step-by-step explanation:

Allow me to revise your question for a better understanding.

A spherical balloon is inflating with helium at a rate of 64π Start Fraction ft cubed Over min End Fraction ft3 min. How fast is the balloon's radius increasing at the instant the radius is 2 ft? How fast is the surface area increasing?

My answer:

Given that:

$(dV)/(dt) = 64\pi \frac{\text{ ft}^3}{\text{min}}$ (1)

As we know that, the volume of a spherical balloon can be calculated by using the following formula:

$V = (4)/(3)\pi r^3$ where r is the radius

Substitute V into (1), we have:

$(dV)/(dt) = (d)/(dt)((4)/(3)\pi r^3)\n\n(dV)/(dt) =4\pi r^2(dr)/(dt)$

In this situation, the instant radius is: 2f

So we have:

$64\pi = 4\pi (2)^2(dr)/(dt)\n\n\Rightarrow (dr)/(dt) = 4$

The radius of the balloon is increasing at a rate of 4 feet per minute

The the surface area has the formula as:

SA1 = 4π $r^(2)$

If the radius of the balloon is increasing at a rate of 4 feet per minute, so the

the surface area will increase 16 feet per minute because:

SA2 : 4π $(4r)^(2)$ = 16 (4π $r^(2)$ ) = 16 SA1

Hope it will find you well.

how many triangles are formed by the diagonal from one vertex in quadrilateral, hexagon, octagon, and decagon??!

Answers

Quadrilateral: two (you can only trace one diagonal and it forms two triangles)

Hexagon: four (you can trace thre diagonals and four triangles are formed)

Octagon: six (you can trace five diagonals and six triangles are formed)

Degagon: eight (you can trace seven diagonals and eight triangles are formed)

It is always true that the number of triangles you can form from a vertex in a convex polygon is the number of sides minus 2.

Evaluate cos 210° without using a calculator by using ratios in a reference triangle.

Answers

210 degrees is a third quadrant degree angle that is in between 180 degrees and 270 degrees. So we expect that the cosine of this angle is equal to a negative value. In this case, the terminal angle of 210 degrees is 30 degrees. Hence, negative cosine of 30 deg is equal to -sqrt 3/2

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Cambridge has a job mowing lawns. He mowed 5 lawns last week and earned $82.50. The table shows his earnings for the week. Which coordinate pair represents the unit rate for this situation?A) (0, 0) B) (1, 16.5) C) (3, 49.5) D) (5, 82.5)