3 years ago

Simplify (x+3)cubed...do I expand?

Mathematics

1 answer:

Rina8888 [55]3 years ago

3 0

(x + 3)^3 = (x + 3)(x + 3)(x + 3) = (x + 3)(x^2 + 6x + 9) = x^3 + 9x^2 + 27x + 27

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3 cos A = 4 sin A find a) cos A b) 3-cot2 A+ cosec2A

Lady_Fox [76]

Answer:

a). cosA = 4/5

b).

$3 - cot {}^{2} a \: + cosec {}^{2} a \: = 0$

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3 years ago

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30 points!!!

lara31 [8.8K]

Answer:

SAS postulate

Step-by-step explanation:

AD (common)

AC = BD (both are diameters)

Angle COD = Ange AOD (vertically opposite angles)

Angle CAD = Angle BAD (angle on the circumference is half the angle at the centre)

Therefore, ABD and DCA are congruent by SAS postulate

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3 years ago

Determine if the two triangles are congruent.

iren [92.7K]

Answer:

Yes they are congruent

Step-by-step explanation:

You know this because of the angle that is marked. You can also know this because of the length of the sides and how its only a rotation of 180 degrees

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The distance around a circle is 37.7 meters long. what is the diameter of the circle?

aksik [14]

Ok so we know that the distance around the circle (or circumference) is equal to the diameter times pi.
This means that
$37.7 = \pi \times d$
d being the diameter,

This means that:
$d = \frac{37.7}{\pi}$
= 12.00028271
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3 years ago

Help me on this please

Rina8888 [55]

Answer:

x = 3.5

Step-by-step explanation:

Triangle to the right:

4^2 + x^2 = 8^2

16 + x^2 = 64

y^2 = 48

Triangle to the left:

x^2 + 6^2 = 48

x^2 + 36 = 48

x^2 = 12

x = sqrt(12)

x = 3.5

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2 years ago