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3 years ago

This is not a multiple choice question. Please help!

Mathematics

1 answer:

Shkiper50 [21]3 years ago

5 0

Complentary angle = 90 degrees

90 - 16 = your answer

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Wat is the value of x in the equation<br>5x + 2(x + 1) = 4

PIT_PIT [208]

Answer:

x = $\bf~\frac{2}{7}~or~0,285$

Step-by-step explanation:

5x + 2(x + 1) = 4

5x + 2x + 2 = 4 (here we got rid of the parenthesis)

7x + 2 = 4 (here we summed both of our x values)

7x = 4 - 2 (here we took #2 to the other side of the equation)

7x = 2 (we subtracted 4 - 2)

x = 2 / 7

x = $\bf~\frac{2}{7}~or~0,285$

Hope it helped,

BiologiaMagister

5 0

4 years ago

Read 2 more answers

A sample of a radioactive isotope had an initial mass of 360 mg in the year 1998 and

RUDIKE [14]

Answer:

193 mg

Step-by-step explanation:

Exponential decay formula:

$A_t = A_0e^r^t$
where Aₜ = mass at time t, A₀ = mass at time 0, r = decay constant (rate), t = time

Our known variables are:

1998 to the year 2004 is a total of t = 6 years.
The sample of radioactive isotope has an initial mass of A₀ = 360 mg at time 0 and a mass of Aₜ = 270 mg at time t.

Let's solve for the decay constant of this sample.

$270=360e^-^r^(^6^)$
$270=360e^-^6^r$
$\frac{3}{4} =e^-^6^r$
$\text{ln} (\frac{3}{4} )= \text{ln}(e^-^6^r)$
$\text{ln} (\frac{3}{4} )=-6r$
$r=-\frac{\text{ln}\frac{3}{4} }{6}$
$r=0.04794701$

Using our new variables, we can now solve for Aₜ at t = 7 years, since we go from 2004 to 2011.

Our new initial mass is A₀ = 270 mg. We solved for the decay constant, r = 0.04794701.

$A_t=270e^-^(^0^.^0^4^7^9^4^8^0^1^)^(^7^)$
$A_t=270e^-^0^.^3^3^5^6^2^9^0^7$
$A_t=193.01982213$

The expected mass of the sample in the year 2011 would be 193 mg.

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3 years ago

How are unlike fractions identified?

I am Lyosha [343]

C, because if it was D, they would be the same, which is A written in another format. Then process of elimination

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Name the polygon right whether it is a regular or not regular

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The polygon is regular

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F(1) = 6 f(n) = f(n – 1) – 5 for integer values of n > 1

natta225 [31]

Look it up lol thats what i di

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