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andrey2020 [161]
3 years ago
14

Select the expression equivalent to (-2x + 8.1y) - (-9x + 5.3y).

Mathematics
1 answer:
andre [41]3 years ago
8 0

Answer:

the answer is d

Step-by-step explanation:

you need to combined like term

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Please do attached question
kondaur [170]

Answer:

ummmmmmmmmmmmmmmmm

Step-by-step explanation:

hmmmmmmmmmmmm

6 0
3 years ago
David was trying to sleep one night but there was too much noise around him? His clock ticked every 5 seconds , a tap was drippi
Monica [59]

Answer:

A) 420 seconds = 7 minutes

B) 8 times

Step-by-step explanation:

A) After how many second would all three things happen together again?

Solution:

His clock ticked every 5 seconds , a tap was dripping every 7 seconds and     his pet dog snored every 12 seconds. It all happens simultaneously = 5*7*12=420 seconds

B) How many times would all three things happen together again between    midnight and one o'clock

Since all these events happen together after every 420 sec = 7 mins and there are 60 mins between midnight and 1 o'çlock , thus 60/7 = 8 times ....

7 0
3 years ago
Solve the system of equation below x+y+z=2 x-y+5z=6
mamaluj [8]
X + y + z = 2
x - y + 5z = 6

cancelando +y com -y:

x + z = 2*(-5)
x + 5z = 6

-5x -5z = -10
...x +5z = 6
---------------------
-4x = -4 *(-1)
4x = 4
x = 4/4
x = 1

x + z = 2
1 + z = 2
z = 2 - 1
z = 1

x + y + z = 2
1 + y + 1 = 2
2 + y = 2
y = 2 - 2
y = 0 

S: {x, y, z} = {1, 0, 1}


8 0
3 years ago
What is the value of x? Enter your answer in the box.
mezya [45]
In triangle the sum of the angles =180,and we have angle=124 so,180-124=56.
X=4
4 0
3 years ago
When a barrel is 30% empty it
blondinia [14]

Answer:

it is 70% full

Step-by-step explanation:

When it is 30 % empty it means it is 70% full

0.7x=0.3x+30

0.7x-0.3x=30

5 0
2 years ago
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