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3 years ago

10

Element U has a half life of T billion years. Find the half life of this element if 1/6 of the original amount is left after 11.

55478 billion years.

1 answer:

olga2289 [7]3 years ago

7 0

Answer:

Step-by-step explanation:

Thick

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(30 POINTS!!!) One press can run the day’s newspapers in 6 hours, while another can do the same job in 8 hours. After running to

mr_godi [17]

Amount of the job done after 2 hours:

2(1/6 + 1/8)

2(4/24 + 3/24)

2(7/24)

7/12 (amount of job finished)

.

amount of job left to do:

1 - 7/12

12/12 - 7/12

5/12 (remaining)

.

Let x = time (hours) slower press takes to finish job

then

x(1/6) = 5/12

multiplying both sides by 6:

x = 5/12 *6

x = 5/2 hours

or

x = 2 hours and 30 minutes

The slower press (8-hour press), will take h 3 hours, 20 minutes to complete the job

8 0

3 years ago

Jason bought 5 movie tickets and a bag of popcorn Jeremy bought 2 movie tickets they spent 54$ total. If the popcorn cost 5$, ho

777dan777 [17]

Total tickets: 7
Popcorn costs: $5
total cost: $54

7x + 5 = 54
- 5 -5

7x = 49

49/7 = 7

Final Answer: x=7

7 0

2 years ago

A woman buys 4metres of cloth costing $40 per metre, and 6metres of cloth costing $45 per metre. How much will she pay altogethe

murzikaleks [220]

Answer:$430

Step-by-step explanation: 40*4 for the first amount of cloth, 6*45 for the second amount. Add those two together and you get 430

3 0

3 years ago

Read 2 more answers

the ratio of peppers to tomatoes in a garden in is 20 / 15. Interpret each ratio and write three equivalent ratios.

Brums [2.3K]

For every 20 peppers there only 15 tomatoes.

20/15

Mutiply top and bottom by 2:

40/30

Multiply top and bottom by 3:

60/45

Multiply top and bottom by 4:

80/60

6 0

2 years ago

Margo can purchase tile at a store for $0.79 per tile and rent a tile saw for $24. At another store she can borrow the tile saw

KATRIN_1 [288]

Margo must buy 60 tiles for the cost to be the same at both stores.

Step-by-step explanation:

Let x be the number of tiles purchased

Then

For Store 1:

24+0.79x

For store 2:

1.19x

For the number of tiles, we have to put both expression equal

$24+0.79x = 1.19x$

subtracting 24 from both sides

$24+0.79x-24 = 1.19x-24\\0.79x=1.19x-24$

Subtracting 1.19x from both sides

$0.79x-1.19x = 1.19x-24-1.19x\\-0.4x = -24$

Dividing both sides by -0.4

$\frac{-0.4x}{-0.4} = \frac{-24}{-0.4}\\x =60$

Hence,

Margo must buy 60 tiles for the cost to be the same at both stores.

Keywords: Linear equations

Learn more about linear equations at:

#LearnwithBrainly

5 0

3 years ago