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
Drupady [299]
3 years ago
15

Find ????⋅ ???? if |????|=3 , |????|=9 , and the angle between ???? and ???? is π2 radians.

Mathematics
1 answer:
mrs_skeptik [129]3 years ago
5 0

Answer:

a{\cdot}b=0

Step-by-step explanation:

It is given that,

Magnitude of a A, |A|=3

magnitude of B, |B|=9

The angle betwern a and b is \dfrac{\pi}{2}\ rad=90^{\circ}

Dot product,

a{\cdot} b=|a||b|\ \cos\theta\\\\a{\cdot} b=3\times 9\times \ \cos(90)\\\\a{\cdot} b=0

So, a.b is equal to 0.

You might be interested in
Solve the equation.<br> C3 = 216
Anna [14]

Step-by-step explanation:

C= 72..............

C3=216

C=216

3

C = 72

Thanks

7 0
2 years ago
Read 2 more answers
Find surface area of rectangular prism
DIA [1.3K]

Answer:

806 yd sq.

Step-by-step explanation:

Area=(length)(width), so to find the surface area you can just find the area of each side and then add then all together.

They already gave you the length of some of the sides, so you should use that to help you find the length of all the sides.

You can see the entire prism's length is 17 yd, width is 4 yd, and height is 14 yd.

The large visible side's area would be (14)(17)= 283 yd. There's another one of these side's on the other side that we can't see. So we would do (283)(2) = 566 yd sq.

Next, we'll find the area of the side on the side by doing (14)(4)=56. Once again, there's two of these sides so we do (56)(2) to get 112 yd sq for this side.

Finally, we'll find the area of the top side. We can do (4)(17) =68, and then (68)(2) to get 138 yd sq.

Now, we have the area of each side of the prism! To find the total surface area, just add them all together. 556+112+138=806.

The surface area would be 806 yd sq.

5 0
2 years ago
What is the greatest common factor of 8x and 40?
Salsk061 [2.6K]

Answer:5

Step-by-step explanation:

3 0
3 years ago
I need to know these new coordinates
hammer [34]
P(-1, 1)
G(2,1)
R(1,-3)
S(-2,-3)
3 0
3 years ago
Logan has a budget of $400 to have family pictures taken. There is a sitting fee of $38. Prints cost $25 per page. How many page
AURORKA [14]

Answer:

14

Step-by-step explanation:

You take the 400 and you minus 38 you get 362 then u divide that by 25 you get 14.48. I personally would just go with 14

4 0
2 years ago
Other questions:
  • Question help in​ statistics, what does df​ denote? if a simple random sample of 2424 speeds of cars on california highway 405 i
    9·1 answer
  • A math problem that equals 8?
    7·2 answers
  • Find the solution to the following system using substitution or elimination
    10·1 answer
  • In a addition problem this is the name for the numbers being added together to get the sum
    10·1 answer
  • Which fraction, in lowest terms, is equivalent to the decimal 0.5?
    14·2 answers
  • Please help me it’s really important for me
    9·1 answer
  • PLEASE HELP AND SHOW YOUR WORK
    5·1 answer
  • Which ones are linear and nonlinear?<br><br>NEED ASAP <br>RIGHT ANSWER WILL GET MARKED AS BRAINLIEST
    14·1 answer
  • Can someone please help me thank you
    8·1 answer
  • On average, a squirrel lives to be 6.5 years old. The lifespan of a squirrel may
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!