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3 years ago

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What's the circumference of a circle that is 9cm? Please explain step by step of how you got the answer...

1 answer:

Sauron [17]3 years ago

4 0

Formula for finding circumference of a circle is 2πr.

Step-by-step explanation:

The given question says what is the circumference of a circle that is 9cm.
As radius is required for finding circumference of a circle, the formula is 2πr.
Therefore taking the formula and substituting radius (r)= 9 cm. We get 2πr as 2×π×9 = 18π cm OR

If we substitute the value of π as 3.14 we will get⇒ 2×3.14×9= 56.52 cm.
So the circumference of the given circle would be 18π or 56.52 cms.

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How do I factor trinomials of a form ax^2+bx+c when a=1 <br><br> In one paragraph

vitfil [10]

Answer:

Trinomials in the form $x^2+bx+c$ can often be factored as the product of two binomials.

Step-by-step explanation:

As we know that a polynomial with three terms is said to be a trinomial.

Considering the trinomial of a form

$ax^2+bx+c$

As

a = 1

so

$x^2+bx+c$

Trinomials in the form $x^2+bx+c$ can often be factored as the product of two binomials.

For example,

$x^2+7x+10$

$=\left(x^2+2x\right)+\left(5x+10\right)$

$=x\left(x+2\right)+5\left(x+2\right)$

$\mathrm{Factor\:out\:common\:term\:}x+2$

$=\left(x+2\right)\left(x+5\right)$

Therefore, Trinomials in the form $x^2+bx+c$ can often be factored as the product of two binomials.

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2 years ago

There are 24 boys and 16 girls in a hall, each holding coins in their hand.

Dmitry_Shevchenko [17]

Answer:

27

Step-by-step explanation:

total=average ×no.

18×40=720 the no. of coins for all children

12×24=288 no. of coins for boys

720-288=432 for all girls

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2 years ago

Lucy draws a line on a coordinate plane. Which transformation will always result in a line perpendicular to Lucy’s line?

k0ka [10]

The first question is c i believe, I dont have time to answer the others

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3 years ago

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3 years ago

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Svetllana [295]

Answer:

Distance=13.60

Step-by-step explanation:

The Distance between the two points in coordinate system is find by using the distance formula.

If two points $(x_1,y_1)$ and $(x_2,y_2)$ are given:

$Distance =\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

For the points:

$(-7, 5)\\ and \\(4, -3)$

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2 years ago