All categories

3 years ago

Want Brainliest? Math help:)

Mathematics

1 answer:

svlad2 [7]3 years ago

7 0

Answer:

a) square root of -8

Step-by-step explanation:

x^2 = -12+4

x^2 = -8

x = square root of -8

method used: idk what to call it.. simplification?

<h2 />

I didn't answer all of them but hopefully someone else answers the others and doesn't just type 'answer' in hopes of getting brainliest lol-

also I don't think this is wrong but if it is then apologies.

You might be interested in

Given the relationship x2 + 3y2 =12, with y > 0 and dx, dt = 2 units/min., find the value of dy, dt at the instant y = 1 unit

matrenka [14]

$\bf x^2+3y^2=12\implies \stackrel{chain~rule}{2x\cfrac{dx}{dt}}+3 \stackrel{chain~rule}{\left(2y\cfrac{dy}{dt}\right)}=0
\\\\\\
2x\cfrac{dx}{dt}+6y\cfrac{dy}{dt}=0
\implies 
6y\cfrac{dy}{dt}=-2x\cfrac{dx}{dt}\implies \cfrac{dy}{dt}=\cfrac{-2x\frac{dx}{dt}}{
6y\frac{dy}{dt}}
\\\\\\
\boxed{\cfrac{dy}{dt}=-\cfrac{x\frac{dx}{dt}}{3y}}\\\\
-------------------------------$

$\bf \textit{now, when y = 1, what is \underline{x}?}\qquad x^2+3y^2=12\implies x^2+3(1)^2=12
\\\\\\
x^2=9\implies x=\sqrt{9}\implies x=3\\\\
-------------------------------\\\\
\begin{cases}
y=1\\
x=3\\
\frac{dx}{dt}=2
\end{cases}\implies \cfrac{dy}{dt}=-\cfrac{3\cdot 2}{3\cdot 1}\implies \cfrac{dy}{dt}=-2$

7 0

2 years ago

Assume you wanted to save $2,000 to buy a used car 18 months from now. How

Scrat [10]

Answer:

27 dollars a week

Step-by-step explanation:

Well there’s 72 weeks in 18 months so 2,000 divided 72 equals 27.

3 0

2 years ago

PLEASE HELP!!! GIVING 40 POINTS!!!

Jobisdone [24]

Answer:

a no solution

b is all real numbers

c x=12

Step-by-step explanation:

a has no values of x that make it true

b any value of x makes it true

c simplify both sides of the equation then isolate x

4 0

3 years ago

Doune Punowing:

nataly862011 [7]

The length of pathway is 10 inches on map.

Step-by-step explanation:

Given,

Total distance = 350 miles

According to map,

1 inch = 35 miles

Let, x be the number of inches on map.

Therefore, using proportion;

Inch : mile :: inch : mile

$1:35::x:350\\$

Product of mean = Product of extreme

$35*x=350*1\\35x=350\\$

Dividing both sides by 35;

$\frac{35x}{35}=\frac{350}{35}\\x=10$

The length of pathway is 10 inches on map.

Keywords: Ratio, proportion

Learn more about proportions at:

#LearnwithBrainly

8 0

2 years ago

A family drove a total of 5,300 miles.They drove 10 more miles in tj second half of the trip than the first half. How many did t

AVprozaik [17]

If they drove a total of 5,300 miles in 2 days, and on the second day they drove 10 more miles then the 1st day.

5,300 ÷ 2 = 2,650

they drove 10 miles less on the first day

2,650 - 10 = 2,640

They drove 2,640 miles on the first day.

Hope this helps. :)

7 0

2 years ago