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babunello [35]
3 years ago
5

The number of known elements changed very rapidly over a 150-year period.

Mathematics
1 answer:
dimaraw [331]3 years ago
6 0

Answer:

118

Step-by-step explanation:

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-15x+8y=-30 -5x+5y=-10
Scilla [17]

Answer:(x,y)=(6,10)


Step-by-step explanation:


4 0
3 years ago
Juan just took a 40 question math test. He scored 75%. How many questions did he get correct
Veronika [31]

Answer:

30

Step-by-step explanation:

  40

x 0.75

-----------

=  30

7 0
3 years ago
Diane received 300 votes in the election for student council president. That was 60% of the students who voted election. How man
VikaD [51]

Answer:

  500

Step-by-step explanation:

The problem statement tells you ...

  300 = 0.60×voters

Dividing by the coefficient of the variable gives ...

  300/0.60 = voters = 500

500 students voted in the election.

8 0
3 years ago
Read 2 more answers
One student can paint a wall in 16 minutes. Another student can paint the same wall in 24 minutes. Working together, about how l
Mazyrski [523]
Let's look at work rates per minute.

Together they can paint the wall in x minutes.
Working together, in 1 minute, they do 1/x of the job.

The student who paints the wall in 16 minutes does 1/16 of the job in 1 minute.
The student who paints the wall in 24 minutes does 1/24 of the job in 1 minute.
Together, they do 1/16 + 1/24 of the job in 1 minute, but from above, we see that together, they do 1/x of the job in 1 minute, so 1/16 + 1/24 must equal 1/x. That gives us our equation.

1/16 + 1/24 = 1/x

1/16 * 3/3 + 1/24 * 2/2 = 1/x

3/48 + 2/48 = 1/x

5/48 = 1/x

x = 48/5 = 9.6

Answer: It takes them 9.6 minutes, or about 10 minutes to do the job together.


5 0
3 years ago
Explain why 0.32 is greater than 0.102
lyudmila [28]

Answer:0.32 is closer the the number one then 0.102 is

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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