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charle [14.2K]
3 years ago
14

Which expression is equivalent to 9+y+y+3

Mathematics
2 answers:
blondinia [14]3 years ago
6 0

Answer:

b

Step-by-step explanation:

You only need to add the real numbers and the ys.

Radda [10]3 years ago
4 0

Answer:

12 + 2y

Step-by-step explanation:

9+y+y+3

Combine like terms

9+3   + y+y

12 + 2y

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14 goes into 28 2 times.
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3 years ago
Over summer, a dam’s water volume reduces from 20 megalitres to 4 megalitres. What fraction of the water in the dam has been los
musickatia [10]

Hey there! I’m happy to help!

Let’s first subtract 4 from 20 to see how much was lost.

20-4=16

Now, we see that 16 is a certain percent of twenty that we want to find. When talking about percents, the word “is” represents an equal sign. So, we can write this equation. We will have p represent our prevent.

16=20p (16 is a certain percent of 20)

Now, we solve by dividing both sides of the equation by 20 to isolate the p.

p=0.8

0.8 is 80% or 4/5, so 4/5 of the dam water has been lost.

Have a wonderful day! :D

7 0
3 years ago
Two sisters start in the same place and walk in opposite directions. The
ddd [48]

Answer:

10 yards

Step-by-step explanation:

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7 0
3 years ago
Read 2 more answers
A GROUP OF STATISTICS STUDENTS DECIDED TO CONDUCT A SURVEY AT THEIR UNIVERSITY TO FIND THE AVERAGE (MEAN) AMOUNT OF TIME STUDENT
Kay [80]

Answer: Option 'c' is correct.

Step-by-step explanation:

Since we have given that

n = 240

mean = 22.3 hours

standard deviation = 6 hours

At 99% level of confidence, z = 2.58

So, interval would be

\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=22.3\pm 2.58\times \dfrac{6}{\sqrt{240}}\\\\=22.3\pm 0.99\\\\=(22.3-0.99,22.3+0.99)\\\\=(21.31,23.29)

Hence, Option 'c' is correct.

3 0
3 years ago
Diego's club earns money for charity when members of the club perform community service after school,each student who does commu
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Answer: domain = 12 students

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Step-by-step explanation:

Given that the total dollar amount earned, E. Is a function of the number of members who perform communityservice, n

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Domain is independent variable n

While range is dependent variable E

Domain is therefore = 12 students

Range = 12 × 5 = $60

3 0
4 years ago
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