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
Kazeer [188]
3 years ago
9

Find a ⋅ b a = 7i - 4j, b = 4i + 3j

Mathematics
1 answer:
Luba_88 [7]3 years ago
7 0
This is a binomial. You can multiply it out by substituting 7i-4j for a, and 4i+3j for b.
(7i-4j)(4i+3j)
you come up with: 28i^2 + 21ij - 16ij -12ij
this then comes out to be 28i^2 -7ij
this is an odd choice of variables for a problem.. let me know if this is the answer you were looking for.

You might be interested in
A company buys computers and printers. Each computer costs $550 and each printer costs $390. If the company spends $8160 and buy
maxonik [38]

Answer:the company bought 12 computers and 4 printers.

Step-by-step explanation:

Let x represent the number of computers that the company bought.

Let y represent the number of printers that the company bought.

The company buys a total of 16 machines. It means that

x + y = 16

Each computer costs $550 and each printer costs $390. If the company spends $8160 for all the computers and printers that was bought, it means that

550x + 390y = 8160 - - - - - - - - - - 1

Substituting x = 16 - y into equation 1, it becomes

550(16 - y) + 390y = 8160

8800 - 550y + 390y = 8160

- 550y + 390y = 8160 - 8800

- 160y = - 640

y = - 640/ - 160

y = 4

Substituting y = 4 into x = 16 - y, it becomes

x = 16 - 4

x = 12

6 0
3 years ago
Catherine went on a trip to the Everglades. She spent 1/3 of her time exploring the swamp and 2/3 of the remaining time bird-wat
valentinak56 [21]
54 minutes 1/3 *2 =54
3 0
4 years ago
Which is the ordered pair
Pani-rosa [81]
Consider the point (-6,1):-
y  = 1 , x = -6 
substituting in the inequality:-
1 >= 1/3 * -6 + 4
1 > 2   which is not true so its not A 

Do same process for the other 3 choices
7 0
3 years ago
8 divided by 5thirds
Igoryamba

Answer:

if you mean 8 devided by 5/3 then the answer is 4.8 :)

Step-by-step explanation:

7 0
3 years ago
Find the slope of the line passing through each of the following pairs of points.
ArbitrLikvidat [17]

Answer:

0

Step-by-step explanation:

m= y2-y1/x2-x1

=0-0/-3-5

=0/-8

=0

7 0
3 years ago
Read 2 more answers
Other questions:
  • PLEASE HELP!!!!!!!!!!!!
    13·1 answer
  • What is pie and how is it used in mathematics
    8·2 answers
  • A hybrid car averages 600 miles on a 12.9 gallon tank of gas. Manuel is planning a 1240-mile vacation in his hybrid car. Find ho
    8·2 answers
  • Consider he function f(x)=2x-4 a.find the inverse of (x) and name it g(x) . Show your work <br /><br /> B. Use funct
    14·1 answer
  • 9 less than g to the 4th power
    14·1 answer
  • Find the LCM of 2 and 10.
    13·2 answers
  • What is the range of the function?<br> A. [-2, 11)<br> B. (-4.0)<br> C. (-4, 4)<br> D. [4, 11)
    9·2 answers
  • What number should be added to the expression x^2+4x to change it into a perfect square trinomial?
    5·2 answers
  • Determine each unit price to the nearest cent. Which deal gives the lowest unit price. Show your thinking.
    8·2 answers
  • PLEASE HELP I WILL MARK BRAINLEST
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!