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SVEN [57.7K]
3 years ago
13

7z= 21 2x + 3y – z =-2 x=_y=_2= x + 2y + 3z = 9

Mathematics
1 answer:
lbvjy [14]3 years ago
7 0

Answer:

1)  7(3) = 21

Step-by-step explanation:

You might be interested in
The ratio of green beads to yellow beads in a bracelet is three to four. The total number of beads is 14. How many green beads a
Alja [10]

Answer:

There are 6 green beads there.

Step-by-step explanation:

This question can be solved by a system of equations.

I am going to say that:

x is the number of green beads

y is the number of yellow beads

The ratio of green beads to yellow beads in a bracelet is three to four.

This means that

\frac{x}{y} = \frac{3}{4}

So

3y = 4x

y = \frac{4x}{3}

The total number of beads is 14.

This means that x + y = 14

How many green beads are there ?

This is x.

x + y = 14

However

y = \frac{4x}{3}

So

x + \frac{4x}{3} = 14

Using multiplying by the gcm(3)

3x + 4x = 42

7x = 42

x = 6

There are 6 green beads there.

4 0
3 years ago
Pls help being timed
Klio2033 [76]

The answer is A( +7) x (-5)

3 0
3 years ago
Read 2 more answers
5. (9r 3 + 5r 2 + 11r) + (-2r 3 + 9r - 8r 2)
ad-work [718]

Answer:

7r³ - 3r² + 20r

Step-by-step explanation:

(9r³ + 5r² + 11r) + (-2r³ + 9r - 8r²)

You can get rid of the parentheses since there is nothing to distribute.

9r³ + 5r² + 11r - 2r³ + 9r - 8r²

Combine like factors.

7r³ - 3r² + 20r

3 0
3 years ago
Hope someone can help me with this
postnew [5]

The perimeter:

40+35+16+16+125.7= 232.7 m

btw lowkey frustrating that they alternate between cm and m


8 0
4 years ago
You are skateboarding at a pace of 30 meters every 5 seconds. your friend is in-line skating at a pace of 9 meters every 2 secon
AnnyKZ [126]

In order to graph the relationship, we will need to write the expression as the equation of a straight line as shown:

d = mt + b

d is the distance covered

t is the time taken

m is the speed

If you are skateboarding at a pace of 30 meters every 5 seconds. your friend is in-line skating at a pace of 9 meters every 2 seconds, this can be written as (5, 30) and (2, 9)

Get the slope of the line:

m = (9-30)/(2-5)

m = -21/-3

m = 7

Substitute m = 7 and the coordinate (2, 9) into the equation y = mt + b

9 = 7(2) + b

9 = 14 + b

b = -5

The required equation to plot will be expressed as y = 7t - 5

Plot the required graph

Learn more here: brainly.com/question/17003809

4 0
3 years ago
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