1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sashaice [31]
2 years ago
13

What fraction of 3 weeks is 18 days?

Mathematics
2 answers:
Rudiy272 years ago
8 0

Answer:

3.78

Step-by-step explanation:

Zielflug [23.3K]2 years ago
3 0

6/7

because 3*7=21 it will become 18/21=6/7

brainliest please

You might be interested in
cory bought 4 apples and 6 oranges and paid 5.10. Dalia bought 2 apples and 5 oranges and paid 3.65. what is the cost of 2 orang
aev [14]

Answer:

pls tell me where cory bought them from. its a very cheap price . i want to buy

Step-by-step explanation:

4 0
3 years ago
CALCULUS - Find the values of in the interval (0,2pi) where the tangent line to the graph of y = sinxcosx is
Rufina [12.5K]

Answer:

\{\frac{\pi}{4}, \frac{3\pi}{4},\frac{5\pi}{4},\frac{7\pi}{4}\}

Step-by-step explanation:

We want to find the values between the interval (0, 2π) where the tangent line to the graph of y=sin(x)cos(x) is horizontal.

Since the tangent line is horizontal, this means that our derivative at those points are 0.

So, first, let's find the derivative of our function.

y=\sin(x)\cos(x)

Take the derivative of both sides with respect to x:

\frac{d}{dx}[y]=\frac{d}{dx}[\sin(x)\cos(x)]

We need to use the product rule:

(uv)'=u'v+uv'

So, differentiate:

y'=\frac{d}{dx}[\sin(x)]\cos(x)+\sin(x)\frac{d}{dx}[\cos(x)]

Evaluate:

y'=(\cos(x))(\cos(x))+\sin(x)(-\sin(x))

Simplify:

y'=\cos^2(x)-\sin^2(x)

Since our tangent line is horizontal, the slope is 0. So, substitute 0 for y':

0=\cos^2(x)-\sin^2(x)

Now, let's solve for x. First, we can use the difference of two squares to obtain:

0=(\cos(x)-\sin(x))(\cos(x)+\sin(x))

Zero Product Property:

0=\cos(x)-\sin(x)\text{ or } 0=\cos(x)+\sin(x)

Solve for each case.

Case 1:

0=\cos(x)-\sin(x)

Add sin(x) to both sides:

\cos(x)=\sin(x)

To solve this, we can use the unit circle.

Recall at what points cosine equals sine.

This only happens twice: at π/4 (45°) and at 5π/4 (225°).

At both of these points, both cosine and sine equals √2/2 and -√2/2.

And between the intervals 0 and 2π, these are the only two times that happens.

Case II:

We have:

0=\cos(x)+\sin(x)

Subtract sine from both sides:

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

Again, we can use the unit circle. Recall when cosine is the opposite of sine.

Like the previous one, this also happens at the 45°. However, this times, it happens at 3π/4 and 7π/4.

At 3π/4, cosine is -√2/2, and sine is √2/2. If we divide by a negative, we will see that cos(x)=-sin(x).

At 7π/4, cosine is √2/2, and sine is -√2/2, thus making our equation true.

Therefore, our solution set is:

\{\frac{\pi}{4}, \frac{3\pi}{4},\frac{5\pi}{4},\frac{7\pi}{4}\}

And we're done!

Edit: Small Mistake :)

5 0
2 years ago
I NEED ANSWER ASAP !!!
aivan3 [116]

Answer:

5

Step-by-step explanation:

3+2x=5x

3=3x

x=1

PR=5

4 0
3 years ago
How Do I do this? What’s the Answer?
frez [133]
F(x) = 5x

for f(7) you replace x with 7 so it will be : f(7) = 5(7) = 35
3 0
3 years ago
Rewrite the expression in z to the n power. The expression I was given is: 1 over z to the negative 1 half power.
12345 [234]

Answer:

The equivalent expression is;

\frac{1}{z^{-\frac{1}{2}}}=z^{\frac{1}{2}}

Step-by-step explanation:

The given expression is:


\frac{1}{z^{-\frac{1}{2} }}

Recall that:

\frac{1}{a^{-m}}=a^m


In our case, a=z and  m=\frac{1}{2}.


We use this property of exponent to obtain;

\frac{1}{z^{-\frac{1}{2}}}=z^{\frac{1}{2}}


6 0
2 years ago
Other questions:
  • In Cherokee County, the fine for speeding is $17 for each mile per hour the driver is traveling over the posted speed limit. In
    11·1 answer
  • What is a absolute value of this rational number negative two third
    14·1 answer
  • If a(x)=3x+1 and b(x)=square root x-4, what is the domain of (b o a)(x)?
    15·2 answers
  • A piece of wire 24 ft long is cut into two pieces. One piece is used to form a square, and the remaining piece is used to form a
    15·1 answer
  • Find the circumference of a circle if the area is 300 square centimeters
    11·1 answer
  • The equation w = 6m+4, relates how a dog's weight varies with age, where m represents its age in months, and the w represents it
    11·1 answer
  • For a certain experiment, the available experimental units are 12 people-six females
    6·1 answer
  • Brainliest goes to whoever answers correctly and explains also if you want extra points answer my other questions
    12·1 answer
  • 4<br> Write 5 as a decimal number.<br> 5
    12·1 answer
  • Pls help me I don’t know how to do it!
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!