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2 years ago

Please answer/do 3-7!! Whoever does it right, i will give brainlest! :) also, PLEASE FILL IT OUT EITHER ON PAPER/ PHONE etc. !!!

Mathematics

2 answers:

meriva2 years ago

7 0

Answer:

3-7 is negitive 4 in your answer it's 3-7 = -4

Step-by-step explanation:

It's negitive four because if you subtract you will get 4 but since it's other way around. And if you do It, it will say that even if there is no negitive sign it won't change the problem because it's still the same problem.

1) 3 - 7

2) there are 3 ways to do this to get the answer:

1) 3/7

2) 7 + 3 - 4 + 3

3) now 7 + 3 is ten - 7 is 3 + 4 is 7, so then if you do 3 - 7 you get negitive four

4) now check your answer by subtracting 3 and 7

5) then you get -4

btw: ( hope this helped :) )

Klio2033 [76]2 years ago

6 0

3. 54.87 + 7.48 = 62.35 55 + 7 = 62

5. 0.215 + 3.74 = 3.955 0 + 3 = 3

7. 18.419 - 6.47 = 11.949 I’m assuming it should be 18 - 6 = 11 because of the decimal but I could be wrong about it

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100 POINTS!!!!!

Oksanka [162]

Answer:

a. Ratio of their circumference = 2:3

b. The ratio of their surface areas = 2:3

c. The ratio of their volume = 4:9

Step-by-step explanation:

Let the cylinders be labelled as A and B respectively.

Diameter of cylinder A = 6 in,

its radius = $\frac{diameter}{2}$

= $\frac{6}{2}$ = 3 in

Diameter of cylinder B = 9 in,

its radius = $\frac{diameter}{2}$

= $\frac{9}{2}$ = 4.5 in

Thus,

a. circumference of a circle = 2 $\pi$ r

Circumference of cylinder A = 2 $\pi$ r

= 2 x $\pi$ x 3

= 6 $\pi$ in

Circumference of cylinder B = 2 $\pi$ r

= 2 x $\pi$ x 4.5

= 9 $\pi$

Ratio of their circumference = $\frac{circumference of cylinder A}{circumference of cylinder B}$

= $\frac{6\pi }{9\pi }$

= 2:3

b. The surface area of a cylinder = 2 $\pi$ rh

the surface area of cylinder A = 2 $\pi$ rh

= 6 $\pi$ h

the surface area of cylinder B = 2 $\pi$ rh

= 9 $\pi$ h

The ratio of their surface areas = $\frac{surface area of cylinder A}{surface area of cylinder B}$

= $\frac{6\pi h}{9\pi h}$

= 2:3

c. Volume of a cylinder = $\pi$ $r^{2}$ h

volume of cylinder A = $\pi$ $r^{2}$ h

= $\pi$ x $3^{2}$ x h

= 9 $\pi$ h

volume of cylinder b = $\pi$ $r^{2}$ h

= $\pi$ x $4.5^{2}$ x h

= 20.25 $\pi$ h

The ratio of their volume = $\frac{volume of cylinder A}{volume of cylinder B}$

= $\frac{9\pi h}{20.25\pi h}$

= 4:9

6 0

2 years ago

If x+y+z=9, xy+yz+zx =26; find x²+y²+z²

vichka [17]

First, we must expand and simplify :
$x + y+z = 9$

$(x + y+z)^{2} = (9)^{2}$

$x^{2} + y^{2}+z^{2} + 2(xy + yz+zx) = 81$

And Than, Enter the value :
$x^{2} + y^{2}+z^{2} + 2(26) = 81$

$x^{2} + y^{2}+z^{2} + 52 = 81$

$x^{2} + y^{2}+z^{2} = 81- 52$

$\boxed{x^{2} + y^{2}+z^{2} = 29}$

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3 years ago

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Ivanshal [37]

Answer:

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Step-by-step explanation:

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2 years ago

Graph the function f(x) = x^2 + 4x - 5 on the coordinate plane

Andreyy89

Hello there!

__________________________

Hello there, I graphed it on my coordinate plane app, I hope that's what you needed.

__________________________

I’ll help with anything else you need!

I hope I helped

@X8lue83rryX

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3 years ago

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How long will it take to earn $252 in interest if $1200 is invested at 7% annual rate interest?

bogdanovich [222]

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2 years ago