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s344n2d4d5 [400]
3 years ago
12

Let u = <-8, -9>. Find 7u. (2 points)

Mathematics
1 answer:
ANEK [815]3 years ago
4 0

Multiplying a vector by a scalar means to multiply each coordinate of the vector by said scalar.

So, we must multiply both entries by 7:

u=(-8, -9)\implies 7u=(-8\cdot 7, -9\cdot 7) = (-56, -63)

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PtichkaEL [24]
Ummm....did you mean like what is the answer to 6x100?
7 0
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EastWind [94]

Answer:

The rental cost of one movie is $2.25 and the rental cost of one video game is $6.25

Step-by-step explanation:

Let the rental cost of 1 movie be m.

Let the rental cost of 1 video game be v.

One month, Tammy rented 2 movies and 6 video games for a total of $42. This means that:

2m + 6v = 42 ________ (1)

The next month she rented 5 movies and 3 video games for a total of $30. This means that:

5m + 3v = 30 _________(2)

We now have two simultaneous equations:

2m + 6v = 42 ________ (1)

5m + 3v = 30 _________(2)

Multiply (2) by 2, and we have:

2m + 6v = 42 __________ (1)

10m + 6v = 60 _________ (3)

Subtract (1) from (3):

 10m + 6v = 60

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 <u>  8m     =     18</u>

=> m = 18 / 8

m = $2.25

Put the value of m back in (1):

2(2.25) + 6v = 42

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=> 6v = 42 - 4.5 = 37.5

v = 37.5 / 6

v = $6.25

Therefore, the rental cost of one movie is $2.25 and the rental cost of one video game is $6.25

5 0
3 years ago
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Annette [7]

Answer:

Algae

Step-by-step explanation:

I just know this I don't know if an explanation is needed..

6 0
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exis [7]

Answer:

<h2><u><em>3.5 Km</em></u></h2>

Step-by-step explanation:

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it is a right triangle and we use Pythagoras

a² = 4² - 2²

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