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3 years ago

PLZ HELP!!! 15 POINTSS

Mathematics

2 answers:

torisob [31]3 years ago

7 0

Answer:

Step-by-step explanation:

Schach [20]3 years ago

6 0

Answer:

Step-by-step explanation:

A sin 2.355/2.355 =0.01745240644 cos -2.355/2.355 root square

=180 so untrue not-1

B. sin =0.01745240644 cos = 0 so untrue not 1.

C sin = 0.01745240644 cos = 180 so untrue not 1

D = - 2.355/2.355= 0.01745240644 cos = 0.01745240644 = -1 so true.

As if we divide 1 into -1 = 1

When we divide 0.01745240644 / 0.01745240644 = will also = 1

The answer is -1 as inverse.

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Petrol and oil are mixed in the ratio 10/1 . How many litres of oil needed to mix with 5 litres of petrol?

valina [46]

Answer:

1/2

Step-by-step explanation:

since 10petrols=1 oil

therefore 5petrols=1/2

7 0

2 years ago

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Can you help me<br>4(b–1)²–9

Tamiku [17]

Answer:

(b-1)²-9

= 4[(b - 1)(b - 1)] - 9

= 4[b² - b - b + 1] - 9

= 4(b² - 2b + 1) - 9

= 4b² - 8b + 4 - 9

= 4b² - 8b - 5

Hope this helps!

7 0

2 years ago

If the measure of angle DCF = 34 and the measure of angle DEF = 90, find the measure of angle CDE.

spayn [35]

Answer:

118

Step-by-step explanation:

Triangle CDE contains angles CDE, DCR and DER

Angles DCR=17 and DER=45 because in a kite, the diagonal on the line of symmetry bisects the angles and 34-2=17 90/2=45

The angles in a triangle add up to 180 and 180-17-45=118, meaning angle DER=118

3 0

3 years ago

I literally luv u if u help omg

WINSTONCH [101]

Answer:

9.49

Step-by-step explanation:

Divide 47.45 by five to find the answer.

7 0

2 years ago

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Help! Pls I cant solve it help me with explanation also pls.

stich3 [128]

Given:

The expression is

$\dfrac{2}{a-2}-\dfrac{8}{a^2-4}$

To find:

The simplified form of the given expression.

Solution:

We have,

$\dfrac{2}{a-2}-\dfrac{8}{a^2-4}$

It can be written as

$=\dfrac{2}{a-2}-\dfrac{8}{a^2-2^2}$

$=\dfrac{2}{a-2}-\dfrac{8}{(a-2)(a+2)}$ $[\because a^2-b^2=(a-b)(a+b)]$

Taking LCM, we get

$=\dfrac{2(a+2)-8}{(a-2)(a+2)}$

$=\dfrac{2a+4-8}{(a-2)(a+2)}$

$=\dfrac{2a-4}{(a-2)(a+2)}$

$=\dfrac{2(a-2)}{(a-2)(a+2)}$

Cancel out the common factors.

$=\dfrac{2}{a+2}$

Therefore, the simplified form of the given expression is $\dfrac{2}{a+2}$ .

7 0

3 years ago