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2 years ago

PLEASE FAST!!!! WILL GIVE BRAINLIEST!!!

Mathematics

1 answer:

ElenaW [278]2 years ago

8 0

Answer: 3 2/9

Step-by-step explanation:

It would be the numbers exact form. Not totally sure but it would be my best guess.

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Solve 2x^2+8x-1=0<br> Using quadratic formula

Molodets [167]

$\bf \qquad \qquad \textit{quadratic formula}\\\\
\begin{array}{llcclll}
&{{ 2}}x^2&{{ +8}}x&{{ +1}}&=0\\
&\uparrow &\uparrow &\uparrow \\
&a&b&c
\end{array} 
\qquad \qquad 
x= \cfrac{ - {{ b}} \pm \sqrt { {{ b}}^2 -4{{ a}}{{ c}}}}{2{{ a}}}$

$\bf x=\cfrac{-8\pm\sqrt{(-8)^2~-~4(2)(1)}}{2(2)}\implies x=\cfrac{-8\pm\sqrt{64~-~8}}{4}
\\\\\\
x=\cfrac{-8\pm\sqrt{56}}{4}\implies x=\cfrac{-8\pm\sqrt{4\cdot 14}}{4}\implies x=\cfrac{-8\pm\sqrt{2^2\cdot 14}}{4}
\\\\\\
x=\cfrac{-8\pm 2\sqrt{14}}{4}\implies x=\cfrac{-4\pm \sqrt{14}}{2}\implies x=
\begin{cases}
\cfrac{-4+\sqrt{14}}{2}\\\\
\cfrac{-4 - \sqrt{14}}{2}
\end{cases}$

6 0

3 years ago

A drug used to relieve anxiety and nervousness has a half-life of 16 hours. if a doctor prescribes one 2.8-milligram every 24 ho

dlinn [17]

After 24 hours, 35.4% of the initial dosage remains on the body.

<h3>What percentage of the last dosage remains?</h3>

The exponential decay is written as:

$f(x) = A*e^{-k*x}$

Where A is the initial value, in this case 2.8mg.

k is the constant of decay, given by the logarithm of 2 over the half life, in this case, is:

$k = ln(2)/16h$

Replacing all that in the above formula, and evaluating in x = 24 hours we get:

$f(24h) = 2.8mg*e^{-24h*ln(2)/16h} = 0.9899 mg$

The percentage of the initial dosage that remains is:

$P = \frac{0.9899mg}{2.8mg}*100\% = 35.4\%$

If you want to learn more about exponential decays:

brainly.com/question/11464095

#SPJ1

8 0

2 years ago

ilia earns $15 for each job he completes as a handyman alongside his uncle. he calculates his total job expenses for supplies to

Dmitriy789 [7]

If you are asking how much money would he have after 20 jobs while earning 15$ for each, here is the answer and explanation.

llia will have 300$ after 20 jobs. If he gets 15$ for each job then 1 is 15$, 2 is 30$, and so on. So we multiply 20 jobs x 15$ and that gives us 300$. I Hope this helps

8 0

3 years ago

380% of what is 99? (Round to the nearest whole number)

scoray [572]

Answer:

Step-by-step explanation:

<u>Let the number be x</u>

380% of x is 99
x*3.8 = 99
x = 99/3.8
x = 26 rounded to the nearest whole number

6 0

3 years ago

Read 2 more answers

HELP I HAVE TO GO IN A MINUTE Which function has a y-value of 12, if the x-value is 3?

Bingel [31]

Y=4x is the answers because four times three equals 12 so it works out

7 0

4 years ago