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3 years ago

Rational number between 1.2 and 1.3 is 1.25 right?

2 answers:

5 0

Yes, since an irrational number is a reapeating decimal point that goes on forever. Unless the infinite decimal point can become a fraction

kherson [118]3 years ago

3 0

Answer:

3/2 or "3 over 2" is apparently a rational number above 1, and below 2... But on yours, I don't know.. Sorry!

Step-by-step explanation:

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Plz, answer. Will mark brainiest. Please! 50 points!!!

igomit [66]

Answer:

12%

Step-by-step explanation:

874990 874990

x 0.12 -----------> - 104998

-------------- -------------------

104998 769991

Hope this helped!

3 0

3 years ago

PROVE THAT: cos 20° - sin 20° = \sqrt{2}sin25°

Lemur [1.5K]

Answer:

See below.

Step-by-step explanation:

$\cos(20)-\sin(20)=\sqrt{2}\sin(25)$

First, use the co-function identity:

$\sin(90-x)=\cos(x)$

We can turn the second term into cosine:

$\sin(20)=\sin(90-70)=\cos(70)$

Substitute:

$\cos(20)-\cos(70)=\sqrt{2}\sin(25)$

Now, use the sum to product formulas. We will use the following:

$\cos(x)-\cos(y)=-2\sin(\frac{x+y}{2})\sin(\frac{x-y}{2})$

Substitute:

$\cos(20)-\cos(70)=-2\sin(\frac{20+70}{2})\sin(\frac{20-70}{2})\\\cos(20)-\cos(70) =-2\sin(45)\sin(-25)\\\cos(20)-\cos(70)=-2(\frac{\sqrt{2}}{2})\sin(-25)\\ \cos(20)-\cos(70)=-\sqrt{2}\sin(-25)$

Use the even-odd identity:

$\sin(-x)=-\sin(x)$

Therefore:

$\cos(20)-\cos(70)=-\sqrt{2}\sin(-25)\\\cos(20)-\cos(70)=-\sqrt{2}\cdot-\sin(25)\\\cos(20)-\cos(70)=\sqrt{2}\sin(25)$

Replace the second term with the original term:

$\cos(20)-\sin(20)=\sqrt{2}\sin(25)$

Proof complete.

4 0

4 years ago

Fill in the table using this function rule. y = 2x + 5

aivan3 [116]

Just put in the x values for example
First one x = 1

y = 2(1) + 5
y= 7

I’ll tell u all the answers here in order:
7
9
15
19

4 0

3 years ago

Read 2 more answers

Find 64% of 50 books. a)33 b)78 c)128 d)320

Semenov [28]

Answer is 32 books
So i am not sure if the answer listed there are correct
But this is the way you solve it
x=number of books
change 64% percent to a decimal, 0.64
Put everyhting into equation
0.64×50=x, then solve
x=32
64% of 50 books is 32 books

4 0

4 years ago

A random sample of 600 adults is taken from a population of over one million, in order to compute a confidence interval for a pr

Maksim231197 [3]

Answer:

9994000

Step-by-step explanation:

4 0

3 years ago