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
Eduardwww [97]
3 years ago
13

Let → a = ⟨ 1 , − 3 ⟩ and → b = ⟨ − 3 , k ⟩. Find k so that →a and → b will be orthogonal (form a 90 degree angle).

Mathematics
1 answer:
Mice21 [21]3 years ago
7 0
If a b is orthogonal , a•b will be 0
a•b=1x-3+-3k=0
so k=-1
You might be interested in
HELPPP!!!
xxMikexx [17]

The angles ∠CFE and ∠AFB are vertically opposite angles. Then the value of x will be 6.

<h3>What is an angle?</h3>

Angle is the space between the line or the surface that meets.  And the angle is measured in degree. For complete 1 rotation, the angle is 360 degrees.

Vertically opposite angle - When two lines intersect, then their opposite angles are equal.

We know that the angle ∠DFE is 90°.

Then the sum of the angle ∠CFD and ∠DFE will be

∠CFD + ∠DFE = 27° + 90°

∠CFD + ∠DFE = 117°

Then the angles ∠CFE and ∠AFB are vertically opposite angles. Then we have

∠CFD = ∠DFE

Put the values

21x - 9 = 117

    21x = 126

        x = 6

More about the angled link is given below.

brainly.com/question/15767203

#SPJ1

8 0
2 years ago
Marco does 14 extra math problems each school night how many extra problems does he do each week. there are 5 school nights in a
Alexus [3.1K]
Marco does 70 extra math problems each week. 14(5)=70 
4 0
3 years ago
Read 2 more answers
You by x packs of pencils, twice as many packs of erasers, and three times as many rolls of tape. Write an expression in the sim
ra1l [238]
Answer- since you are buying x packs of pencils, 2x packs of erasers, and 3x rolls of tape, you would be buying a total of 6x items.
7 0
3 years ago
The LM = 3x - 2, LN = 2x + 1, and MN = 5x - 2.
USPshnik [31]
The answer would come out to be 26
6 0
3 years ago
How are lines best fit and other trend lines used with scatter plots?
skad [1K]
- Line<span> of </span>Best Fit<span>. A </span>line<span> of </span>best fit<span> (or "</span>trend<span>" </span>line<span>) is a straight </span>line<span> that </span>best<span> represents the data on a </span>scatter plot<span>. This </span>line<span> may pass through some of the points, none of the points, or all of the points.</span>
6 0
3 years ago
Other questions:
  • David can finish painting the room in 6 hours, and his elder brother Antony can finish it in 4 hours. If both brothers paint the
    9·1 answer
  • What is -5 plus -10 minus 41562 times 6
    9·2 answers
  • Which answer shows this equation in standard form?
    7·1 answer
  • Whats 4x+12 divided by 3
    15·1 answer
  • Find the diameter in units.
    14·1 answer
  • If an area of a circle is 58 square feet find the circumference
    14·1 answer
  • How many real solutions does this system of equations have? <br><br> (x−3)^2+(y+1)^2=16x−7=0
    8·2 answers
  • HEY BIT**ES I FINESHED MAH MAKEUP AND I NEED YALL FINE A**ES TO RATE ME
    10·2 answers
  • Mr. Ortega bought his home for $242,800. It is
    7·1 answer
  • The c and y intercept
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!