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4 years ago

Use the ratio table to simplify 7/20

Mathematics

1 answer:

Goshia [24]4 years ago

8 0

Answer:

7/20

Step-by-step explanation:

This is because 7/20 is already at its simplest form. But, however, you could turn it into 0.35 which is the decimal form of 7/20.

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640 times 3 is what can someone help me in this problem

Tasya [4]

1920, is your answer.

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3 years ago

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NEED HELP PLEASE ANSWER ASAP! (41)

ExtremeBDS [4]

Answer:

41. (2) x² - 3x - 4 =0

Step-by-step explanation:

Question 41

Standard form of polynomial

x² - (sum of roots) + product of roots = 0
(2) x² - 3x - 4 =0

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3 years ago

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The first term of a sequence is 3. The common difference of the sequence is 10 less than twice the first term. Write the equatio

polet [3.4K]

d = 2*3 -10 = -4

The n-th term of the sequence is

.. t[n] = 3 +d(n -1) = 7 -4n

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3 years ago

The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.

blagie [28]

Answer:

$N(t) =N_o (\frac{1}{2})^{\frac{t}{t_{1/2}}}$

Where $t_{1/2}= 3.3 hr$ represent the half life and the intial amount would be $N_o = 1$

And we want to find the time in order to have a 95% of decay so we can set up the following equation:

$0.05 = 1 (0.5)^{t/3.3}$

If we apply natural log on both sides we got:

$ln(0.05) = \frac{t}{3.3} ln (0.5)$

And solving for t we got:

$t= 3.3 *\frac{ln(0.05)}{ln(0.5)}= 14.26$

So then would takes about 14.26 hours in order to have 95% of the lead to decay

Step-by-step explanation:

For this case we can define the variable of interest amount of Pb209 and for the half life would be given:

$N(t) =N_o (\frac{1}{2})^{\frac{t}{t_{1/2}}}$

Where $t_{1/2}= 3.3 hr$ represent the half life and the intial amount would be $N_o = 1$

And we want to find the time in order to have a 95% of decay so we can set up the following equation:

$0.05 = 1 (0.5)^{t/3.3}$

If we apply natural log on both sides we got:

$ln(0.05) = \frac{t}{3.3} ln (0.5)$

And solving for t we got:

$t= 3.3 *\frac{ln(0.05)}{ln(0.5)}= 14.26$

So then would takes about 14.26 hours in order to have 95% of the lead to decay

4 0

3 years ago

Determine the slope and y-intercept -6x-5y=15

Delicious77 [7]

The slope of a line in form ax+by=c is -a/b
the yint of the line is c/b

so

-6x-5y=15
slope=-(-6)/-5=6/-5=-6/5
yint is 15/-5=-15/5=-3

slope=-6/5
yint is -3

or you could just do slope intercept and solve for y
y=mx+b
m=slope
b=yintercept

slope=-6/5
yint is -3

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3 years ago

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