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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.

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Please can someone help me?
Debora [2.8K]
If the perimeters are equal, you can form an equation to find x:
x + x + 12 + x + x + 12 = x + 11 + x + 11 + x + 16
4x + 24 = 3x + 38
- 3x
x + 24 = 38
- 24
x = 14
Now you can substitute the x value into the perimeter:
(4 × 14) + 24
56 + 24 = 80 cm

(3 × 14) + 38
42 + 38 = 80 cm

So the perimeter would be 80 cm.
I hope this helps!
6 0
3 years ago
For the line 2x+ 3y=6, the x-intercept is ____ and the y-intercept is ____.
Reptile [31]

Answer:

2 and 3

Step-by-step explanation:

the x-intercept is 2

the y-intercept is 3

8 0
3 years ago
Which of the following equations could be used to solve for x in the triangle shown?
erastovalidia [21]
Sin ( theta ) = opposite / hypotenuse
sin ( 37° ) = 13 / x
5 0
3 years ago
Read 2 more answers
18,20/4.5,5 what is the slope
Lyrx [107]

Answer:

10/9 or 1.1 repeating

Step-by-step explanation:

Use formula y2-y1/x2-x1.

If you liked my answer please make it the brainliest that would be much appreciated. Thanks!

7 0
3 years ago
NEED HELP PLEASE THANK YOU​
KiRa [710]

Answer:

D C

Step-by-step explanation:

first one because you do 5 to left and makes it 5 because its 1 per mile

seound one because go up 7 its at the school.

and sorry i cant see the other ones.

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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