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skad [1K]
2 years ago
11

What is the answer for my khan academy homework

Mathematics
2 answers:
Verdich [7]2 years ago
7 0

Answer:

12

Step-by-step explanation:

16 divided by 4 is 4

8 + 4 : 12

Svetllana [295]2 years ago
6 0

Answer:12

Step-by-step explanation: plug the 16 into were the a is in the question

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Alguien me ayuda porfiss
zimovet [89]

Answer:

Step-by-step explanation: a, c, and e

4 0
2 years ago
pls There are (4^9)^5 ⋅ 4^0 books at the library. What is the total number of books at the library? A.4^9 B. 4^45 C. 4^46 D. 1  
jekas [21]
We know that there are (4^9)^5 ⋅ 4^0 at the library, so we just need to simplify this to get the answer.
(4^9)^5 ⋅ 4^0
=(4^9)^5×1
=(4^9)^5
=4^9×5
=4^45. As a result, the total number of books at the library is 4^45 books at the library or B is the final answer. Hope it help!
6 0
3 years ago
Step by step explanation on how to solve -22-(6)(-9)/3
timofeeve [1]

Answer:

-4

Step-by-step explanation:

-22-(6)(-9)/3

my bad it shows explanation

5 0
3 years ago
Read 2 more answers
Average movie prices in the United States​ are, in​ general, lower than in other countries. It would cost ​$78.73 to buy three t
likoan [24]

Average movie ticket cost in Japan = $17.23

Average movie ticket cost in Switzerland = $ 13.52

Step-by-step explanation:

Let <em>x</em> be the cost of movie ticket in Japan and <em><u>y</u></em> be the cost of movie ticket in Switzerland.

Given 3 ticket in Japan + 2 tickets in Switzerland = $78.73

              ⇒ 3<em>x</em> + 2<em>y</em> = 78.73 – – – – (1)

Given 3 ticket in Switzerland + 2 tickets in Japan = $75.02

              ⇒ 3<em>y</em> + 2<em>x</em> = 75.02

              ⇒ 2<em>x</em> + 3<em>y</em> = 75.02– – – – – (2)

Now, to solve (1) and (2), we multiply equation (1) by 2 and equation (2) by 3.

(1) × 2 ⇒       6<em>x</em> + 4<em>y</em> = 157.46 – – – – (3)

(2) × 3 ⇒       6<em>x</em> + 9<em>y</em> = 225.06 – – – – (4)

Subtract (3) from (4), we get

6<em>x </em>+ 9<em>y</em> – (6<em>x</em> + 4<em>y</em>)= 225.06 – 157.46

⇒ 6<em>x</em> + 9<em>y</em> – 6<em>x </em>– 4<em>y</em>= 67.6

⇒ 5<em>y</em> = 67.6

⇒ <em>y</em> = 13.52

Now substitute <em>y</em> = 13.52 in equation (1), we get,

(1) ⇒ 3<em>x</em> + 2(13.52) = 78.73

⇒ 3<em>x</em> = 78.73 – 27.04

⇒ <em>x</em> = 27.23

Hence, Average movie ticket cost in Japan is $27.23

Average movie ticket cost in Switzerland is $ 13.52.

4 0
3 years ago
Find the general solution to 1/x dy/dx - 2y/x^2 = x cos x, y(pi) = pi^2
Finger [1]

Answer:

\frac{y}{x^2}=\sin x+\pi

Step-by-step explanation:

Consider linear differential equation \frac{\mathrm{d} y}{\mathrm{d} x}+yp(x)=q(x)

It's solution is of form y\,I.F=\int I.F\,q(x)\,dx where I.F is integrating factor given by I.F=e^{\int p(x)\,dx}.

Given: \frac{1}{x}\frac{\mathrm{d} y}{\mathrm{d} x}-\frac{2y}{x^2}=x\cos x

We can write this equation as \frac{\mathrm{d} y}{\mathrm{d} x}-\frac{2y}{x}=x^2\cos x

On comparing this equation with \frac{\mathrm{d} y}{\mathrm{d} x}+yp(x)=q(x), we get p(x)=\frac{-2}{x}\,\,,\,\,q(x)=x^2\cos x

I.F = e^{\int p(x)\,dx}=e^{\int \frac{-2}{x}\,dx}=e^{-2\ln x}=e^{\ln x^{-2}}=\frac{1}{x^2}      { formula used: \ln a^b=b\ln a }

we get solution as follows:

\frac{y}{x^2}=\int \frac{1}{x^2}x^2\cos x\,dx\\\frac{y}{x^2}=\int \cos x\,dx\\\\\frac{y}{x^2}=\sin x+C

{ formula used: \int \cos x\,dx=\sin x }

Applying condition:y(\pi)=\pi^2

\frac{y}{x^2}=\sin x+C\\\frac{\pi^2}{\pi}=\sin\pi+C\\\pi=C

So, we get solution as :

\frac{y}{x^2}=\sin x+\pi

4 0
3 years ago
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