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
Lady_Fox [76]
3 years ago
8

Find a ⋅ b. a = <5, 2>, b = <4, 5>

Mathematics
1 answer:
cestrela7 [59]3 years ago
6 0

Answer:

  30

Step-by-step explanation:

For a = <xa, ya> and b = <xb, yb>, the dot product is the sum of products ...

  a·b = (xa)(xb) + (ya)(yb)

Substituting the given information, you have ...

  a·b = 5·4 + 2·5 = 20 + 10

  a·b = 30

_____

Some graphing calculators can do such math. There are also dot product calculators available on the Internet. If you have quite a few of these to calculate, you can put the appropriate formula into a spreadsheet.

You might be interested in
What is the exact value of x? 5⋅21^5x=16
IRINA_888 [86]

Answer:

x=  16 /20420505

Step-by-step explanation:

Let's solve your equation step-by-step.

5(215)x=16

Step 1: Simplify both sides of the equation.

20420505x=16

Step 2: Divide both sides by 20420505.

20420505x /20420505  =  16 /20420505

x=  16 /20420505

4 0
2 years ago
The unit cost for a piece of fabric is $4.99 per yard including tax. You have $30 to spend on material. How many whole feet of m
Svetllana [295]
1 yd = 3 ft

This means the unit cost per feet is $4.99/3.

Let 'x' represent the length of the material in feet that you can be with $30.

(4.99/3)*x <= 30
6 0
2 years ago
What is 9 /29/40 as a decimal
Luden [163]
9.725 would be the answer
4 0
2 years ago
Round each addendum to the nearest ten. 478 + 112
Amiraneli [1.4K]
500 and 100 because if you see the seven right, seven is the judge and so as the one. Make it 500 and the next number 100. So you'll have en estimate of 600. Ur welcome.
8 0
3 years ago
Two cars raced at a race track. The faster car traveled 20 mph faster than the slower car. In the time that the slower car trave
kakasveta [241]

Answer:

pano yan paturo

Step-by-step explanation:

hinde ko alam

8 0
3 years ago
Other questions:
  • In the American Heart Association journal Hypertension, researchers report that individuals who practice Transcendental Meditati
    8·1 answer
  • a ski shop has a markup rate of 50% find the selling price of skis that cost the store owner $300. tell me how you got the answe
    10·1 answer
  • (2/5 - 1/10) + 2^3 - 23/25<br> A) 1 12/25<br> B) 2 2/5<br> C) 3 8/25<br> D) 4 3/5
    14·2 answers
  • Rewrite the equation of the parabola in vertex form. y= x2 + 8x - 21
    5·2 answers
  • The area of the square adjacent to two sides of a right triangle are 29.25 square units and 13 units 30 POINTS
    10·1 answer
  • At the same day, if 12 o'clock the same, afternoon 2 o'clock plus 2, how much does 8 o'clock owe?
    6·1 answer
  • One of ten different prizes was randomly put into each box of a cereal. If a family decided to buy this cereal until it obtained
    9·1 answer
  • Can someone help on this question plz
    9·1 answer
  • Find mZ1 and mZ2 .<br><br> I cant figure it out
    9·1 answer
  • PLEASEE HEELLLP!!! I'LL GIVE BRAINLIEST!
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!