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Liula [17]
3 years ago
10

1 1/4 subtracted from its reciprocal is : A -9/20. B - 1/20. C 1/5. D - 1/5

Mathematics
2 answers:
dalvyx [7]3 years ago
7 0

Answer:

Step-by-step explanation:

first we turn ur mixed number into an improper fraction

1 1/4 = 5/4

the reciprocal of 5/4 can be found by just flipping it....so the reciprocal is gonna be 4/5

so 1 1/4 subtracted from its reciprocal is :

4/5 - 5/4 =

16/20 - 25/20 =

- 9/20 <====

SIZIF [17.4K]3 years ago
7 0
I believe it’s -9/20. It’s based on reciprocals.
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You find the surface area of a cube by using A=6a^2
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A number is equal to twice a smaller number plus 3. The same number is equal to twice the sum of the smaller
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I don't know what you think about it is not going to be a great day of school

8 0
3 years ago
A piggy bank contains $4.45 is dimes and quarters. If the bank contains 25 coins, how many dimes are in the bank?
saul85 [17]

Answer:

12

Step-by-step explanation:

12 dimes is $1.20, so your total for the quarters is $3.25. Since there are 25 coins total and 12 of them are dimes, 25 - 12 = 13, so you have 13 quarters. 13 times its value of 25 cents leaves you with $3.25, fulfilling your needed total.

There likely was an easier way to do this, but I'm unfamiliar with it so I ended up doing this.

4 0
2 years ago
Andre said, "I found two figures that are congruent, so they can’t be similar."
soldier1979 [14.2K]

Answer:

Diego

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6 0
2 years ago
Suppose that circles R and S have a central angle measuring 80°. Additionally, the measure of the sector for circle R is 32 9 π
liq [111]
We know that

The measure of the sector of circle R is 32π/9 m².
The measure of the central angle is 80°. 
This means that the sector is 80/360 = 2/9 of the circle. 
The area of a circle is given by A=πr²,
so
 the area of the sector is A=2/9πr².
  To verify this, 2/9π(4²) = 2/9π(16) = 32π/9.

Using this same formula for circle S, we will work backward to find the radius:
18π = 2/9πr²
Multiply both sides by 9:18*9π = 2πr²162π = 2πr²
Divide both sides by 2π:162π/2π = 2πr²/2π81 = r²
Take the square root of both sides:√81 = √r²  r=9 m

the answer is 
the radius of circle S is r=9 m

alternative method

Let 

rA--------> radius of the circle R

rB-------> radius of the circle S

SA------> the area of the sector for circle R

SB------> the area of the sector for circle S

 

we have that

rA=4 m

rB=?

SA=32π/9 m²

SB=18π m²

 

we know that

 

if Both circle A and circle B have a central angle , the square of the ratio of the radius of circle A to the radius of circle B is equals to the ratio of the area of the sector for circle A to the area of the sector for circle B

 (rA/rB) ^2=SA/SB-----> rB²=(SB/SA)*rA²-----> rB²=(18π/32π/9)*4²-----> rB²=162/2

rB=9 m
3 0
3 years ago
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