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3 years ago

What are fractions? Plz help

Mathematics

2 answers:

Mekhanik [1.2K]3 years ago

8 0

Answer:hy Alex add me bc my account got deleted am ash by the way lol

Step-by-step explanation:

Colt1911 [192]3 years ago

7 0

fractions are numbers that are not whole, so they are represented as the top number which is how many parts there are which is called the numerator. The bottom number which is how many parts there are in total, which is called the denominator. There are improper, proper and mixed fraction.

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I need help with this question

malfutka [58]

Answer:

Step-by-step explanation:

7 0

3 years ago

How many times does 8 go into 65

kozerog [31]

8 can go as much as 8.125 or 8 1/8 times in 65. This is done by using a basic mathematical operation which is division. 65 is divided by 8 which will give us the answer of 8.125 or in fraction form it would be 8 1/8.

3 0

3 years ago

Find the exact value of cot(15degrees) using half angle formulas?

liubo4ka [24]

Double angle (or half angle, depending how you look at it) identities:

$\cos^2\dfrac x2=\dfrac{1+\cos x}2$

$\sin^2\dfrac x2=\dfrac{1-\cos x}2$

$\implies\cot^2\dfrac x2=\dfrac{\cos^2\frac x2}{\sin^2\frac x2}=\dfrac{1+\cos x}{1-\cos x}$

So we have

$\cot^215^\circ=\dfrac{1+\cos30^\circ}{1-\cos30^\circ}=\dfrac{1+\frac{\sqrt3}2}{1-\frac{\sqrt3}2}$

$\implies\cot^215^\circ=7+4\sqrt3$

$\implies\cot15^\circ=\sqrt{7+4\sqrt3}=2+\sqrt3$

Note that when taking the square root, we should take into account that that could yield two possible solutions, but we know $\cos15^\circ>0$ and $\sin15^\circ>0$ , so it's also the case that $\cot15^\circ>0$ .

Also, the reason we have equality in the last step can be explained like so:

$7+4\sqrt3=4+4\sqrt3+3=4+4\sqrt3+(\sqrt3)^2=(2+\sqrt3)^2$

(not unlike the process used to complete the square)

8 0

3 years ago

Read 2 more answers

20% of 770 is what number

Ludmilka [50]

Answer:

154

Step-by-step explanation:

just take 20% out of 770

3 0

3 years ago

Read 2 more answers

Which postulate or theorem proves that △QRS and △TRS are congruent?

Vanyuwa [196]

Answer:

Option D is correct.

SAS Congruence Postulates

Step-by-step explanation:

In Δ QRS and Δ TRS

$QS \cong ST$ [Side] [Given]

$RS \cong RS$ [Common Side] [Given]

$\angle RSQ \cong \angle RST = 90^{\circ}$ [Angle]

SAS(Side- Angle -Side) postulates states states that if two sides and the included angle of one triangle are congruent to two sides and the included angle of another triangle, then the two triangles are congruent.

Then, by SAS postulates

$\triangle QRS \cong \triangle TRS$

8 0

3 years ago