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3 years ago

Please help! I don't know what to do :

Mathematics

2 answers:

Alecsey [184]3 years ago

8 0

Answer:

-2.5(4x-8) + 1.2 (5x-1)

-10x+20+6x-1.2

Step-by-step explanation:

distributive property means multiplying the parentheses by the numbers outside.

so the answer is B

Crazy boy [7]3 years ago

6 0

Distributive Property: a(b+c)=ab+ac

So, is the step where the parentheses are removed.

-2.5(4x-8)+1.2(5x-1)

-10x+20+6x-1.2

B is the answer.

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Answer:

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Step-by-step explanation:

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Andreas93 [3]

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2 years ago

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Prove the trigonometric identity

Annette [7]

Answer:

Proved See below

Step-by-step explanation:

Man this one is a world of its own :D Just a quick question are you a fellow Add Math student in O levels i remember this question from back in the day :D Anyhow Lets get started

For this question we need to know the following identities:

$1+tan^{2}x=sec^2x\\\\1+cot^2x=cosec^2x\\\\sin^2x+cos^2x=1$

Lets solve the bottom most part first:

$1-\frac{1}{1-sec^2x} \\\\$

Take LCM

$1-\frac{1}{1-sec^2x} \\\\\frac{1-sec^2x-1}{1-sec^2x} \\\\\frac{-sec^2x}{1-sec^2x} \\\\\frac{-(1+tan^2x)}{-tan^2x}$

now break the LCM

$\frac{-1}{-tan^2x}+\frac{-tan^2x}{-tan^2x}\\\\\frac{1}{tan^2x}+1\\\\cot^2x+1$

because 1/tan = cot x

and furthermore,

$cot^2x+1\\cosec^2x$

now we solve the above part and replace the bottom most part that we solved with $cosec^2x$

$\frac{1}{1-\frac{1}{cosec^2x} } \\\\\frac{1}{1-sin^2x} \\\\\frac{1}{cos^2x}\\\\sec^2x$

Hence proved! :D

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3 years ago

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Anna [14]

Answer: The length is 45

Explanttio:

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3 years ago

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erica [24]

Answer:

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Step-by-step explanation:

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2 years ago