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2 years ago

Choose the correct answer: PLS HELP ASAP 30 points plsss

Mathematics

1 answer:

a_sh-v [17]2 years ago

4 0

Answer:

$\frac{x-4}{5x}$

Step-by-step explanation:

The equation;

$\frac{x^{2} - 8x + 16}{5x}$ ÷ x - 4

Factor;

$\frac{(x-4)^{2}}{5x}$ ÷ ( x - 4 )

Rewrite in fraction form, so that one can perform division

$\frac{(x-4)^2}{5x} * \frac{1}{x-4}$

Simplify, cancel out like terms on opposite sides of the fraction bar

$\frac{x-4}{5x}$

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The area of a circular sun spot is growing at a rate of 1,200 km2/s.

Tpy6a [65]

A)

$\bf \textit{area of a circle}\\\\
A=\pi r^2
\\\\\\
\cfrac{dA}{dt}=\pi \cdot 2r\cfrac{dr}{dt}\implies \cfrac{dA}{dt}=2\pi r\cfrac{dr}{dt}\implies \cfrac{\frac{dA}{dt}}{2\pi r}=\cfrac{dr}{dt}\\\\
-----------------------------\\\\
\left. \cfrac{dr}{dt} \right|_{r=3000}\implies \cfrac{1200}{2\pi \cdot 3000}=\cfrac{dr}{dt}\\\\$

B)

$\bf A=\pi r^2\qquad A=490000\implies 490000=\pi r^2\implies \sqrt{\cfrac{490000}{\pi }}=r
\\\\\\
\left. \cfrac{dr}{dt} \right|_{r=\sqrt{\frac{490000}{\pi }}}\implies \cfrac{1200}{2\pi \cdot \sqrt{\frac{490000}{\pi }}}=\cfrac{dr}{dt}
$

8 0

2 years ago

In a particular class, exams are worth 50% of the overall grade, quizzes are worth 30% of the overall grade, homework is worth 1

Paha777 [63]

Answer:

The student's overall grade is 85.79%

Step-by-step explanation:

Given in the question that:

Exam = 50%; Quiz = 30%, Home work = 15% and Class participation = 5%

The total giving us 100%.

A particular student scored the following;

87.9% on exams, 77.8% quiz, 90% Home work and 100% on class participation

Calculating the percentages the student had for each;

Exam total = 50*0.879 = 43.95% earned

Quiz = 30*0.778 = 23.34% earned

Home work = 15*0.9 = 13.5% earned

Class participation = 5*1 = 5% earned

Total earned = 43.95+ 23.34 + 13.5+ 5 = 85.79%

3 0

3 years ago

I WILL GIVE BRAINLY!!!!!!!!!

kenny6666 [7]

Answer: C. 5(6) + 0.65y

Step-by-step explanation:

Process of elimination.

65% of y = 0.65y

A has 65y, completely incorrect.

B has 6y, also completely incorrect.

<u>C has 0.65y, correct.</u>

D has 1.65y, also completely incorrect.

8 0

3 years ago

(y* - 5)(yx + 5)<br> please help

Nina [5.8K]

Answer:

Simplified the expression.

y2x+5y−5yx−25

I think this is what were were asking, if not please explain better.

Hope this helps :D

plz like & brainly

7 0

3 years ago

The function rule T(m)=450-8m represents the amount of water T(m) (in liters) in a holding tank after being drained at a rate of

suter [353]

Well they give you the equation and they want you to solve for time given that you know the amount of water in the tank. They tell you T=274 and that

T=450-8m so using the value T=274 in the equation to the left gives you:

274=450-8m subtract 450 from both sides

-176=-8m divide both sides by -8

22=m

So 22 minutes have passed when there is 274L remaining...

7 0

3 years ago

Read 2 more answers