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2 years ago

What is the answer to this please help

Mathematics

2 answers:

mash [69]2 years ago

7 0

Answer:

$2\sqrt{42} + 7\sqrt{2} -6- \sqrt{21}$

Step-by-step explanation:

$(\sqrt{14} - \sqrt{3})(\sqrt{12} + \sqrt{7})$

root 12 can be changed to 2 root 3

then multiply

then simply

and you should get ur answer

Elis [28]2 years ago

4 0

Answer:

use calculater please it will not take long

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You are situated 300 feet from the base of Tower Glitz Plaza watching an external elevator descend down the side of the building

nordsb [41]

Answer:

18.66 ft/s

Step-by-step explanation:

The distance between you and the elevator is given by:

$h=\sqrt{x^2+y^2}$

The rate of change for the distance between you and the elevator is given by:

$\frac{dh}{dt}=\frac{dh}{dy}*\frac{dy}{dt}$

$-16=\frac{dh}{dy}*\frac{dy}{dt}$

$\frac{dh}{dy}=\frac{d}{dy} (\sqrt{x^2+y^2})\\$

Applying the chain rule:

$u=x^2+y^2\\\frac{dh}{dy}=\frac{d\sqrt u}{du} *\frac{du}{dy}\\\frac{dh}{dy}=\frac{1}{2\sqrt u} *2y\\\frac{dh}{dy}=\frac{y}{\sqrt {(x^2+y^2)}}$

Therefore, at x=300 and y = 500, dy/dt is:

$-16=\frac{y}{\sqrt {(x^2+y^2)}}*\frac{dy}{dt}\\-16=\frac{500}{\sqrt {(300^2+500^2)}}*\frac{dy}{dt}\\\frac{dy}{dt}=-18.66\ ft/s$

The elevator is descending at 18.66 ft/s.

7 0

3 years ago

2) AY RA O positive zero O negative O undefined

bezimeni [28]

Answer:

negative

hope it helps;)

8 0

3 years ago

Read 2 more answers

There are 550 students at Martin Middle School. One bundred and eighty- seven students walk to school. what percent of the stude

Anvisha [2.4K]

For a question like this, all you have to do is remember that a percentage is simply a fraction expressed as a decimal. So, all we have to do is:
$\frac{187}{550}$ , and then multiply our decimal answer by 100 to get the percentage:
$\frac{187}{550}$ = 0.34
0.34 x 100 = 34
Therefore 34% of the students walk to school.
I hope this helped and remember to please try and understand the maths that got the answer, not just writing the answer down :))

4 0

3 years ago

Simplify (-56) = 7. o O A-8 O B. 9 O a -9 O D. 8

Sever21 [200]

Answer:

Step-by-step explanation:

o=-8

-56=7*(-8)=-56

3 0

2 years ago

12^x-2=20 solve for x

ioda

Your answer is x=1.243927

7 0

3 years ago