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1 year ago

8

Titanium-51 decays with a half-life of 6 minutes. How many minutes will it take for 480 grams of titanium-51 to decay down to ju

st 15 grams?

1 answer:

qaws [65]1 year ago

4 0

Your answer would be 5 minutes

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The model represents the equation <br> 4x+ 4 = 12<br> What value of x makes the equation true

myrzilka [38]

Answer:

B

Step-by-step explanation:

All you have to basically do on this one is go backwards.

The beginning equation is 4x+4=12, so to first revesre the adding we are going to use 12, the product, and subtract 4 from it (since that is what was added).

12-4=8

Now you need to reverse the times 4, so to do that just divide instead because that is the invese of multiplication.

8/4=2

Now you have 2, which is the variable, x. To make sure this is right you can just put it into the equation and see if 4x2+4 is 12

Hope this helped!

6 0

2 years ago

10. MJ and Peter Parker leave school traveling in opposite

Paladinen [302]

Using proportions, it is found that:

Peter is walking at a rate of 3 km/h.
MJ is biking at a rate of 9 km/h.

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

Peter is walking at a rate of x km/h.
MJ is biking 6 km/h faster than Peter, thus 6 + x km/h.
Opposite directions, thus, their distance increases at a rate of (6 + 2x) km each hour, as $6 + x + x = 6 + 2x$ .

6 + 2x km each hour, 18 km after 1.5 hours, thus, the rule of three is:

1h - (6 + 2x) km

1.5h - 18 km

Applying cross multiplication:

$1.5(6 + 2x) = 18$

$9 + 3x = 18$

$3x = 9$

$x = \frac{9}{3}$

$x = 3$

$x + 6 = 3 + 6 = 9$

Then:

Peter is walking at a rate of 3 km/h.
MJ is biking at a rate of 9 km/h.

A similar problem is given at brainly.com/question/24112433

6 0

1 year ago

A company invests $15,000.00 in an account that compounds interest annually. After two years, the account is worth $16,099.44. U

ANEK [815]

Principal = $15000
Amount = $16099.44
Rat of interest = r
Time = 2 years
Then
A = P(1 + r)^t
16099.44 = 15000 (1 + r)^2
(1 + r)^2 = 1.073
(1 + r)^2 = (1.036)^2
Then
1 + r = 1.036
r = 1.036 - 1
= 0.036
= 0.036/100
= 3.6%
From the above deduction, it can be easily concluded that the correct option among all the options that are given in the question is the second option.

6 0

3 years ago

The circumference of a circle is 257 cm. What is the area,<br> in<br> square<br> centimeters

nikdorinn [45]

Answer:

$2\pi \times r = c$

$\pi \times {r}^{2} = a$

A=5257.76

Step-by-step explanation:

Or use a calculator online.

7 0

2 years ago

Read 2 more answers

Montel spends $0.75 every time he plays his favorite video game. If you have $10, write and resolve an inequality to calculate h

Bumek [7]

Answer:13.333333 repeating

Step-by-step explanation:money divided by how much the games cost

3 0

2 years ago