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3 years ago

The sum of the digits of a certain two-digit number is 13. Reversing its digits decreases the number by 45. Find the number..

Mathematics

1 answer:

lesya [120]3 years ago

5 0

Answer:

......................

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(3x+2x^4)+(3x-5x^4)

natka813 [3]

Answer:

6x -3x^4

Step-by-step explanation:

Eliminate parentheses. Since the multiplying coefficient is +1, the parentheses can simply be dropped:

= 3x +2x^4 +3x -5x^4

Add like terms (ones with the same exponent on the variable).

= 3x +3x +2x^4 -5x^4 . . . . . . . group like terms together

= (3+3)x +(2-5)x^4

= 6x -3x^4

7 0

4 years ago

7.5 meal; 6.5% tax<br><br><br> PLS HELP ME!!!!!!

malfutka [58]

Answer:

$7.99

Step-by-step explanation:

6.5% of 7.5 = 0.4875

7.5 + 0.4875 = 7.9875 or about 7.99

6 0

3 years ago

How to factor the. problem completely

den301095 [7]

The correct answer is d

6 0

3 years ago

Which of the following groups listed below are subsets of the real numbers? Natural Numbers Rational Numbers Integers Whole Numb

Deffense [45]

The answer is Whole Numbers.

3 0

3 years ago

I don’t know how to solve this

Lady_Fox [76]

Answer:

$\theta =2\pi k,\ \ k\in Z\ \\\text{or}\ \\\theta=-\dfrac{2\pi}{3}+2\pi k,\ \ k\in Z$

Step-by-step explanation:

Given:

$\cos \theta-\sqrt{3}\sin \theta=1$

Divide this equation by 2:

$\dfrac{1}{2}\cos \theta-\dfrac{\sqrt{3}}{2}\sin \theta=\dfrac{1}{2}$

Note that

$\cos \dfrac{\pi }{3}=\dfrac{1}{2}\\ \\\sin \dfrac{\pi }{3}=\dfrac{\sqrt{3}}{2}$

So, the previous equation is

$\cos \dfrac{\pi}{3}\cdot \cos \theta-\sin \dfrac{\pi}{3}\cdot \sin \theta=\dfrac{1}{2}$

Remind that

$\cos x\cos y-\sin x\sin y=\cos (x+y),$

then

$\cos \left(\dfrac{\pi}{3}+\theta\right)=\dfrac{1}{2}$

The solution of this equation is

$\dfrac{\pi}{3}+\theta=\pm \arccos \dfrac{1}{2}+2\pi k,\ \ k\in Z\\ \\\dfrac{\pi}{3}+\theta=\pm \dfrac{\pi}{3}+2\pi k,\ \ k\in Z\\ \\\theta =2\pi k,\ \ k\in Z\ \text{or}\ \theta=-\dfrac{2\pi}{3}+2\pi k,\ \ k\in Z$

8 0

3 years ago