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Kipish [7]
3 years ago
13

I only need help for no. 10

Mathematics
1 answer:
Stels [109]3 years ago
4 0
Use the quadratic formula and a=4, b=3, c=-4

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PLEASE I NEED HELP IF IT'S WRONG I WILL REPORT
Alinara [238K]

Answer:

what do you need help wth ?

Step-by-step explanation:

3 0
3 years ago
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Use the exponential decay​ model, Upper A equals Upper A 0 e Superscript kt​, to solve the following. The​ half-life of a certai
Akimi4 [234]

Answer:

It will take 7 years ( approx )

Step-by-step explanation:

Given equation that shows the amount of the substance after t years,

A=A_0 e^{kt}

Where,

A_0 = Initial amount of the substance,

If the half life of the substance is 19 years,

Then if t = 19, amount of the substance = \frac{A_0}{2},

i.e.

\frac{A_0}{2}=A_0 e^{19k}

\frac{1}{2} = e^{19k}

0.5 = e^{19k}

Taking ln both sides,

\ln(0.5) = \ln(e^{19k})

\ln(0.5) = 19k

\implies k = \frac{\ln(0.5)}{19}\approx -0.03648

Now, if the substance to decay to 78​% of its original​ amount,

Then A=78\% \text{ of }A_0 =\frac{78A_0}{100}=0.78 A_0

0.78 A_0=A_0 e^{-0.03648t}

0.78 = e^{-0.03648t}

Again taking ln both sides,

\ln(0.78) = -0.03648t

-0.24846=-0.03648t

\implies t = \frac{0.24846}{0.03648}=6.81085\approx 7

Hence, approximately the substance would be 78% of its initial value after 7 years.

5 0
2 years ago
Calvin's plane is flying at a speed of 600 miles per hour. If y represents the distance the plane has traveled and z represents
Klio2033 [76]
I think it would be D but i am not for sure

6 0
2 years ago
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Generate two equivalent fractions for each fraction. Use fraction tiles or number lines.
oksano4ka [1.4K]
Remember that finding common denominators is only one of the strategies for comparing fractions
5 0
2 years ago
Been stuck on this for a while plzz help
ExtremeBDS [4]

Answer:

Answer is 18!

Step-by-step explanation:

hope this helps

4 0
2 years ago
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