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4 years ago

Please help!!!!!!!!!!!!!!!

Mathematics

1 answer:

icang [17]4 years ago

4 0

Answer:

im not sure

Step-by-step explanation:

go to www.analyzemath.com

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Study the function below. f(x) = –3x Label the function as proportional or non-proportional. Explain your reasoning.

Nimfa-mama [501]

Y = f(x) = -3x y = -3x y = (constant) x y is proportional to x.<span> Hence we can say Y is proportional to x , having (-3) as proportionality Constant. hope this helps</span>

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3 years ago

3 is 25% of what number?

stira [4]

Answer:

Step-by-step explanation:

25%=1/4

of=*

3=1/4x

3 divided by 1/4 or 0.25 =12

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3 years ago

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Element X is a radioactive isotope such that its mass decreases by 26% every day. If an experiment starts out with 810 grams of

ioda

Answer:

The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

The function to represent the mass of the sample after t days is $A(t) = 810(0.74)^t$

Step-by-step explanation:

Exponential equation of decay:

The exponential equation for the amount of a substance is given by:

$A(t) = A(0)(1-r)^t$

In which A(0) is the initial amount and r is the decay rate, as a decimal.

Hourly rate of change:

Decreases 26% by day. A day has 24 hours. This means that $A(24) = (1-0.26)A(0) = 0.74A(0)$ ; We use this to find r.

$A(t) = A(0)(1-r)^t$

$0.74A(0) = A(0)(1-r)^{24}$

$(1-r)^{24} = 0.74$

$\sqrt[24]{(1-r)^{24}} = \sqrt[24]{0.74}$

$1 - r = (0.74)^{\frac{1}{24}}$

$1 - r = 0.9875$

$r = 1 - 0.9875 = 0.0125$

The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

Starts out with 810 grams of Element X

This means that $A(0) = 810$

Element X is a radioactive isotope such that its mass decreases by 26% every day.

This means that we use, for this equation, r = 0.26.

The equation is:

$A(t) = A(0)(1-r)^t$

$A(t) = 810(1 - 0.26)^t$

$A(t) = 810(0.74)^t$

The function to represent the mass of the sample after t days is $A(t) = 810(0.74)^t$

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3 years ago

Help please this my little brother work

masha68 [24]

Huh? What do you mean I don't understand

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A 24-ft ladder leans against the outside wall of a school, waiting for someone to climb and fix a broken window. The base of the

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