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Lostsunrise [7]
4 years ago
7

If two vectors are perpendicular, then their dot product must be zero.

Mathematics
1 answer:
Marina CMI [18]4 years ago
4 0
True since the dot product is defined as a.b=abcos(x)
since they are perpendicular x=90 cos(90)=0
hence a.b=0
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one bricklayer can build a wall in 6 hours. another bricklayer could build the same wall in 4 hours. if they work together, how
kogti [31]
Hello,

Let's
V1 the velocity of the 1st bricklayer,
V2 the velocity of the 2nd bricklayer,

1wall=V1*6==>V1=w/6
1wall=V2*4==>V2=w/4
==>V1+V2=w/6+w/4=10w*24=5w/12

Let's t the time for the 2 bricklayer to build the wall
(V1+V2)t=w
==>5w/12*t=w
==>t=12/5 (h)=2h24min.



8 0
3 years ago
Whats the area of a square that is 9m and 9m?
siniylev [52]

Answer:

81 m².

Step-by-step explanation:

To find the area of a square, you will simply need to do the side-length squared, or A= l^{2}.

If the side-length is 9, we can do:

A = 9²

A = 81 m²

6 0
4 years ago
Read 2 more answers
The ages of three friends are consecutive integers. The sum of their ages is 45
Alborosie

45 = (x) + (x + 1) + (x + 2)

45 = 3x + 3

- 3

42 = 3x

/3

14 = x

45 = 14 + (14 + 1) + (14 + 2)

45 = 14 + 15 + 16

The ages of the 3 friends are 14, 15, and 16.

6 0
4 years ago
Read 2 more answers
WILL GIVE BRAINLIEST!
grin007 [14]

Answer:

D

Step-by-step explanation:

12.50 x 5 = 62.5

62.5 + 20 = 82.5

6 0
3 years ago
Ron's yearly income is $44,300 and has $4,400 withheld for taxes and $2,400 for personal deductions. If he gets paid biweekly, w
Ilia_Sergeevich [38]

Answer:

Net biweekly pay for each paycheck is \$1442

Step-by-step explanation:

Employees paid biweekly are paid 26 times a year.

So, Required Biweekly net pay =\frac{44300-4400-2400}{26}

\approx 1442

Best Regards!

4 0
4 years ago
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