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
Basile [38]
3 years ago
9

NEED HELP !!! What is the right answer ? 15pts

Mathematics
1 answer:
SIZIF [17.4K]3 years ago
6 0
What grade is this from?
You might be interested in
Three vectors A, B, C in three-dimensional space satisfy the following properties
wlad13 [49]

Answer:

\frac{7}{8}\pi

Step-by-step explanation:

observe

||a–b+c|| = ||a+b+c||

(a-b+c)² = (a+b+c)²

(a+b+c)² – (a-b+c)² = 0

((a+b+c)+(a-b+c))((a+b+c)–(a-b+c)) = 0

(2a+2c)(2b) = 0

(a+c)b = 0

a•b + c•b = 0

||a||×||b||×cos(π/8) + ||c||×||b||×cos(θ) = 0

\cos(\theta)=-\frac{||a||\times ||b|| \times \cos(\frac{\pi}{8})}{||c||\times ||b||}=-\cos(\frac{\pi}{8})\\ \theta=\frac{7}{8}\pi

3 0
3 years ago
Which of the following is a which of the following is a rational number?
Nastasia [14]

Answer:

A. √25

General Formulas and Concepts:

<u>Math</u>

  • Rational Numbers - numbers that can be written as integers, terminating decimals, or fractions
  • Irrational Numbers - numbers that have non-terminating decimals i.e infinite decimals and cannot be written into a fraction

Step-by-step explanation:

<u>Step 1: Define</u>

A. √25

B. √123

C. √20

D. π

<u>Step 2: Identify</u>

A. √25 = 5; Rational

B. √123 ≈ 11.0905...; Irrational

C. √20 = 2√5 ≈ 4.47214...; Irrational

D. π ≈ 3.1415926535897932384626433832795...; Irrational

Therefore, our answer choice is A.

5 0
2 years ago
Is 25 pt or 13 qt bigger
Lina20 [59]
Each qt has 2 pts in it.

13 qts add up to 26 pts.

That's more than 25 pts.
5 0
3 years ago
The perimeter of a rectangular swimming pool is represented by the expression 8x – 2.
sineoko [7]

Im pretty sure your answer would be D, 6x

but tell me if im wrong.

5 0
2 years ago
Can 12/15 be simplify
Semmy [17]
Yes 12/15 can be simplified. 

To simplify 12/15 find the greatest common multiple. The <span> greatest common multiple of 12/15 is 3. Now divide 12/15 by 3. 
</span>
12 ÷ 3 = 4 
15 ÷ 3 = 5 

4/5 is the simplified version of 12/15


6 0
3 years ago
Other questions:
  • ms. myree's bill at a restaurant was $24.20 before tax the sales tax rate was 0.05 and ms.myree also included a $5 tip how much
    5·1 answer
  • A number added to itself equals ten
    14·2 answers
  • On a recent shopping trip, Arnold started with $150. He spent these amounts at various stores $49.81, $32.43, $25.90, $14.58, $2
    13·1 answer
  • The temperature went from 83 at noon to 72 at midnight. What is the percent of decrease in the temperature from noon to midnight
    8·2 answers
  • If *(pic below)* complete the following statement<br> f(6)=___
    9·1 answer
  • Terry had his car repaired at ace auto. He was charged $50 per hour of labor plus $150 for parts. It's total bill for the repair
    15·1 answer
  • This coordinate grid shows where Alberto's school is located. Each unit represents one block. Alberto's house is at (3,4). The l
    5·2 answers
  • Please help me ..........................
    8·1 answer
  • Can someone solve? i’ll mark brainliest!
    11·1 answer
  • Abosolute value of -5
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!