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sweet [91]
3 years ago
14

What is the reciprocal

Mathematics
2 answers:
Stells [14]3 years ago
8 0
The reciprocal of 7/12  is 12/7. In fractions you flop the fractions.  So your answer would  C   12/7.  Hope this helps
weqwewe [10]3 years ago
3 0
Answer is C. 7/12 has the reciprocal of 12/7. When You multiply by a reciprocal, you just switch the numerator and denominator. The answer does NOT become negative. It would change the fraction itself.
Example:
3/6= 6/3
5/7= 7/5
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Vsevolod [243]
1st one on second row I think
7 0
3 years ago
What is the circumference of the following circle?
satela [25.4K]

Answer:

9.42 or 3pi

Step-by-step explanation:

equation of a circle is 2*pi*r

2r is d which is 3 so the answer would be 3pi which equals about 9.42

4 0
2 years ago
Circle 1, Circle 2, and Circle 3 have the same center and have radii, respectively, of r₁ cm, r₂ cm, r₃ cm, where r₁ < r₂ &lt
ira [324]

Answer:

a) A₁ /A₂  =  r₁² / (r₂²   - r₁²)

b) A₂ /A₃  = (r₂²   - r₁²) / (r₃²   - r₂²)

Step-by-step explanation:

We have Circle 1  and area  A₁  

Area of circle 2 outside circle 1     =  A₂

Area of circle 3 outside circle 2    = A₃

On the other hand we have

A₁  = π*r₁²   area of circle 1

A₂´ =  π*r₂² area of circle 2

A₃´ = π*r₃²  area of circle 3

All areas in cm²

a) A₁ /A₂        

A₁  =  π*r₁²

According to problem statement  A₂  = π*r₂²  -   A₁

A₂  =  π*r₂²  -   π*r₁²      ⇒         A₂  =  π* (r₂²   - r₁²)

Then  A₁ /A₂  =   π*r₁² / [π* (r₂²   - r₁²)]

A₁ /A₂  =  r₁² / (r₂²   - r₁²)

b)  A₂ /A₃        

A₂  =   π* (r₂²   - r₁²)

And

A₃   =  π* (r₃²   - r₂²)

Therefore

A₂ /A₃  =   π* (r₂²   - r₁²) / π* (r₃²   - r₂²)  ⇒  A₂ /A₃  = (r₂²   - r₁²) / (r₃²   - r₂²)

A₂ /A₃  = (r₂²   - r₁²) / (r₃²   - r₂²)

6 0
3 years ago
What is the square number for 10
guajiro [1.7K]
10^2 equals 100

10 x 10=100
4 0
3 years ago
Mary wanted to know the amount of time 7th grade students spend on homework each week, so she surveyed 20 students at random. Th
kodGreya [7K]

Answer:

See explanation.

Step-by-step explanation:

<u>Aim of experiment:</u>

To discover the amount of time (average amount of time) that 7th grade students spend on homework each week.

<u>Name of researcher:</u>

Mary.

<u>Requirements for the experiment:</u>

- knowledge of the number of hours that some or all of the students spend on homework each week

- knowledge of the total number of 7th grade students (population statistics)

<u>The issue or problem with this question </u>is that it doesn't say what Mary found out after her research. There are no result statistics from the experiment! Mary surveyed 20 students out of the 164. Her findings will/can be used to infer about the population. Those findings are absent here, hence the question can't be solved.

<u />

4 0
3 years ago
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