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1 year ago

7

How much of a radioactive kind of francium will be left after 44 minutes if you start with 2,616 grams and the half-life is 22 m

inutes?

2 answers:

Andrei [34K]1 year ago

8 0

ABCDEFGHIJKLMNOPQRSTUVWXYZ

Katyanochek1 [597]1 year ago

6 0

Step-by-step explanation:

sorry but I dont know

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What is the Difference Between a 16-Ounce Brick and a Carpenter?

Andrew [12]

One weighs a pound, and the other pounds away!

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3 years ago

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Please help fassssst

Zarrin [17]

Answer:

$\dfrac{9}{2}$

Step-by-step explanation:

You can do this using the quadratic equation:

$x =\dfrac{-b\pm\sqrt{b^{2}-4ac}}{2a}$

Let's first setup our expression:

4x² + 12x = 135

the quadratic formula is:

ax² + bx + c = 0

4x² + 12x - 135 = 0

Then:

a = 4

b = 12

c = -135

Now we plug in our coefficients and solve:

$x =\dfrac{-12\pm\sqrt{12^{2}-4(4)(-135)}}{2(4)}$

We solve for both to determine the positive one:

$x =\dfrac{-12+ \sqrt{12^{2}-4(4)(-135)}}{2(4)}$ $x =\dfrac{-12- \sqrt{12^{2}-4(4)(-135)}}{2(4)}$

$x =\dfrac{-12+ \sqrt{144+2160}}{8}$ $x =\dfrac{-12- \sqrt{144+2160}}{8}$

$x =\dfrac{-12+ \sqrt{2304}}{8}$ $x =\dfrac{-12- \sqrt{2304}}{8}$

$x =\dfrac{-12+ 48}{8}$ $x =\dfrac{-12- 48}{8}$

$x =\dfrac{36}{8} = \dfrac{9}{2}$ $x =\dfrac{-60}{8} = \dfrac{-15}{2}$

So if you are looking for a positive solution, just take the positive one as x.

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2 years ago

Please help i need to find the constant of proportionality

abruzzese [7]

Answer:

4

Step-by-step explanation:

y = 4*x

y = 4*1.5 = 6

y = 4*2.25 = 9

y = 4* 3.25 = 13

3 0

2 years ago

Adam went to Target and bought items for $45.05, $9.29, and $0.89. How much did these three

andriy [413]

The answer is 55. 23 dollars because if you add 45.05
+. 9.29
—————————
54.34
+. 0. 89
—————————
55.23

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3 years ago

What is 7/9 - 5/18 lowest common denominator

NISA [10]

7/9 = 14/18
14-5=9
9/18=1/2

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3 years ago

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