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
Alex17521 [72]
2 years ago
6

Who ever gets this right will get a brainlest

Mathematics
2 answers:
dalvyx [7]2 years ago
4 0
The answer is straight angle for sure since its a straight line
Georgia [21]2 years ago
3 0

Answer:

Straight

Step-by-step explanation:

Right angle is 90° ⊥

Acute is less than 90∠

Obtuse is more than 90, less than 180

Straight angle is 180, a straight line

You might be interested in
Help with this problem please.
saul85 [17]
A. More reasonable is 5 because the 4 is closest to the lowest number, being 5.
B. About 10 times more
7 0
3 years ago
Hellooo i'm an 8th grader in an algebra 1 class so i will be clueless but my problem is
Shalnov [3]
Add 3x to both sides of the equation which means y=13+3x
3 0
3 years ago
Read 2 more answers
(11 + 5) + 52 × (12 − 10)
melomori [17]

Answer:

120

Step-by-step explanation:

11+5+52(12−10)

=16+52(12−10)

=16+(52)(2)

=16+104

=120

5 0
3 years ago
Find the exact value of the expression.<br> tan( sin−1 (2/3)− cos−1(1/7))
Sonja [21]

Answer:

\tan(a-b)=\frac{2\sqrt{5}-20\sqrt{3}}{5+8\sqrt{15}}

Step-by-step explanation:

I'm going to use the following identity to help with the difference inside the tangent function there:

\tan(a-b)=\frac{\tan(a)-\tan(b)}{1+\tan(a)\tan(b)}

Let a=\sin^{-1}(\frac{2}{3}).

With some restriction on a this means:

\sin(a)=\frac{2}{3}

We need to find \tan(a).

\sin^2(a)+\cos^2(a)=1 is a Pythagorean Identity I will use to find the cosine value and then I will use that the tangent function is the ratio of sine to cosine.

(\frac{2}{3})^2+\cos^2(a)=1

\frac{4}{9}+\cos^2(a)=1

Subtract 4/9 on both sides:

\cos^2(a)=\frac{5}{9}

Take the square root of both sides:

\cos(a)=\pm \sqrt{\frac{5}{9}}

\cos(a)=\pm \frac{\sqrt{5}}{3}

The cosine value is positive because a is a number between -\frac{\pi}{2} and \frac{\pi}{2} because that is the restriction on sine inverse.

So we have \cos(a)=\frac{\sqrt{5}}{3}.

This means that \tan(a)=\frac{\frac{2}{3}}{\frac{\sqrt{5}}{3}}.

Multiplying numerator and denominator by 3 gives us:

\tan(a)=\frac{2}{\sqrt{5}}

Rationalizing the denominator by multiplying top and bottom by square root of 5 gives us:

\tan(a)=\frac{2\sqrt{5}}{5}

Let's continue on to letting b=\cos^{-1}(\frac{1}{7}).

Let's go ahead and say what the restrictions on b are.

b is a number in between 0 and \pi.

So anyways b=\cos^{-1}(\frac{1}{7}) implies \cos(b)=\frac{1}{7}.

Let's use the Pythagorean Identity again I mentioned from before to find the sine value of b.

\cos^2(b)+\sin^2(b)=1

(\frac{1}{7})^2+\sin^2(b)=1

\frac{1}{49}+\sin^2(b)=1

Subtract 1/49 on both sides:

\sin^2(b)=\frac{48}{49}

Take the square root of both sides:

\sin(b)=\pm \sqrt{\frac{48}{49}

\sin(b)=\pm \frac{\sqrt{48}}{7}

\sin(b)=\pm \frac{\sqrt{16}\sqrt{3}}{7}

\sin(b)=\pm \frac{4\sqrt{3}}{7}

So since b is a number between 0 and \pi, then sine of this value is positive.

This implies:

\sin(b)=\frac{4\sqrt{3}}{7}

So \tan(b)=\frac{\sin(b)}{\cos(b)}=\frac{\frac{4\sqrt{3}}{7}}{\frac{1}{7}}.

Multiplying both top and bottom by 7 gives:

\frac{4\sqrt{3}}{1}= 4\sqrt{3}.

Let's put everything back into the first mentioned identity.

\tan(a-b)=\frac{\tan(a)-\tan(b)}{1+\tan(a)\tan(b)}

\tan(a-b)=\frac{\frac{2\sqrt{5}}{5}-4\sqrt{3}}{1+\frac{2\sqrt{5}}{5}\cdot 4\sqrt{3}}

Let's clear the mini-fractions by multiply top and bottom by the least common multiple of the denominators of these mini-fractions. That is, we are multiplying top and bottom by 5:

\tan(a-b)=\frac{2 \sqrt{5}-20\sqrt{3}}{5+2\sqrt{5}\cdot 4\sqrt{3}}

\tan(a-b)=\frac{2\sqrt{5}-20\sqrt{3}}{5+8\sqrt{15}}

4 0
3 years ago
The sum of 2x+7 and −x+12 is equal to 14 what is x?
Alekssandra [29.7K]

Answer:-5


Step-by-step explanation:

2x+7-x+12=14

x+19=14

x=-5

                 


4 0
3 years ago
Other questions:
  • Find the LCM of the pair of numbers. 6 and 12. The lcm is
    7·2 answers
  • Which of these cannot represent the lengths of the sides of a right triangle A.3ft, 4ft, 5ft B.6in, 8in, 10in C.16cm, 63cm, 65cm
    11·1 answer
  • Solve photo question, please. :)
    11·1 answer
  • What rational number represents a drop of ​ 4 1/4 ​ in.?
    5·1 answer
  • I need help in this page​
    14·2 answers
  • HELP I NEED HELP WITH 1,2 and 8
    15·1 answer
  • Here is a better pic​
    7·1 answer
  • The point B(-6, -2) is rotated 90° counterclockwise<br> coordinates of the resulting point, B'?
    8·1 answer
  • The Surface Area of a sphere is 36π cm2. Find its diameter.
    5·1 answer
  • ✓<br> What is the value of the expression below?<br> -8+ 9+8<br> 0<br> 11<br> 19<br> 35
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!