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gregori [183]
3 years ago
13

Factorise :x^2-4x-21+10y-y^2​

Mathematics
1 answer:
Elenna [48]3 years ago
4 0

Answer:

This cannot factor

Step-by-step explanation:

This cannot factor because there is no number that can be factored out of all of the terms.

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The circumference of a circle is 28π inches. What is the length of the radius of this circle?
devlian [24]

Answer:

The radius of the circle is 14 inches.

Step-by-step explanation:

How is the circumference of a circle related to its radius?

\displaystyle \text{Circumference} = \pi\times \text{Diameter} = \pi\;(2\times \text{Radius}).

In brief,

\text{Circumference} = 2\pi\times \text{Radius}.

For this question,

  • \text{Circumference} = 28\pi, and
  • \text{Radius} needs to be found.

Divide both sides of the equation by 2\pi:

\displaystyle \frac{\text{Circumference}}{2\pi} = \text{Radius}.

\displaystyle \text{Radius} = \frac{\text{Circumference}}{2\pi} = \frac{28\pi}{2\pi} = 14.

In other words, the radius of this circle is 14 inches.

6 0
3 years ago
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1/2 is the same number as
MrRa [10]

Answer:

.5

Step-by-step explanation:

1 Divided by 2 is .5 or 1/2

3 0
3 years ago
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The surface area of the solid is about ____ inches squared
Dafna11 [192]

Answer:

Surface area of the whole figure=  320.28inch^2

Step-by-step explanation:

The surface area of the figure :

Surface area of the cylinder(excluding top)+Surface area of the cone(excluding bottom)

Radius of the cylinder=3 inch     and  Height of cylinder=13 inch

Surface area of the cylinder with one circular face

                                    =2\pi rh+\pi r^2

As,     \pi =\frac{22}{7}= 3.14

   =(2*3.14*3*13)+(3.14*3*3)\\\\=244.92+28.26\\\\=273.18inch^2

Surface area of the cone excluding  base:

                =\pi *r*l

l= slant height=5 inch       r= radius= 3 inch

Surface area of the cone =3.14*3*5

                                        =47.1inch^2

Total surface area of the whole figure=273.18+47.1

                                                           =  320.28inch^2

5 0
3 years ago
2 45 is a common multiple of 5 and 9 true or false
Strike441 [17]

Answer:

False

Step-by-step explanation:

6 0
2 years ago
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HELP ME PLEASE I NEEEED IT<br><br> SOLVE FOR D
Softa [21]

Answer:

theres 2

Step-by-step explanation:

6 0
3 years ago
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