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4 years ago

Please help will mark brainiest!!!!!!!!!

Mathematics

1 answer:

Lorico [155]4 years ago

4 0

1. Rational. It is non-terminating but repeating.

2. Irrational. It is non-terminating, non-repeating

3. Irrational. π is irrational

4. Rational. √49 is 7

5. Irrational. 22 is not a square.

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Please help Me 41 points

nexus9112 [7]

Answer: u already have the answer so thank u for the answer and the 21. Points

Step-by-step explanation:

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3 years ago

Sin(60-theta)sin(60+theta)

ehidna [41]

Step-by-step explanation:

$\sin(60 - \theta) \sin(60 + \theta) \\ = \{ \sin(60) \cos( \theta) - \sin( \theta) \cos(60) \} \{ \sin(60) \cos( \theta) + \cos(60) \sin( \theta) \} \\ = \{ \frac{ \sqrt{3} }{2} \cos( \theta) - \frac{1}{2} \sin( \theta) \} \{ \frac{ \sqrt{3} }{2} \cos( \theta) + \frac{1}{2} \sin( \theta) \} \\ \\$

from difference of two squares:

${ \boxed{(a - b)(a + b) = ( {a}^{2} - {b}^{2} ) }}$

therefore:

$= \{ {( \frac{ \sqrt{3} }{2}) }^{2} { \cos }^{2} \theta \} - \{ {( \frac{ \sqrt{3} }{2} )}^{2} { \sin }^{2} \theta \} \\ \\ = \frac{3}{4} { \cos }^{2} \theta - \frac{3}{4} { \sin}^{2} \theta$

factorise out ¾ :

$= \frac{3}{4} ( { \cos }^{2} \theta - { \sin}^{2} \theta) \\ \\ = { \boxed{ \frac{3}{4} \cos(2 \theta) }}$

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3 years ago

Read 2 more answers

If the temperature is 45 degrees and it decreases by 15 degrees, what is the final temperature? I

Hoochie [10]

Answer:

Step-by-step explanation:

45-15

7 0

2 years ago

Help me plz idk how

Alika [10]

Hello there,

For problem one
The mile is an appropriate unit to measure the distance run over a one-week period.

For problem two
The pound is an appropriate unit to measure the weight of a bag of sugar.

For problem three
The yard is an appropriate unit to measure the distance run on a football field.

Hope this helps!

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3 years ago

If i randomly pick a polynomial, is it more likely to have real roots or complex roots?

Vinil7 [7]

I would say you are more likely to have complex roots. If you think of graphs of polynomials, if you draw a function that doesn't pass through the x-axis, all roots are complex.

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4 years ago