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IRISSAK [1]
3 years ago
7

If (x/100-1)(x/100+1)=kx^2-1 k=

Mathematics
1 answer:
Artist 52 [7]3 years ago
3 0
(x/100-1)(x/100+1)=kx^2-1
(x/100-1)(x/100+1)=(x/100)^2 - 1^2 because it's a difference of squares ( (a-b)(a+b) = a^2-ab+ab-b^2 = a^2 - b^2):
(x/100)^2 - 1^2=kx^2 - 1
(x/100)^2 - 1=kx^2 - 1
(x/100)^2=kx^2
(x^2)/(100^2)=kx^2
1/(100^2)=k
1/10000=k
k=0.0001
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A shop has a sale that offers 20% off all prices.On the final day reduce all the sale prices by 25%.Linz buys a radio on the fin
Mrac [35]

Answer:

40%

Step-by-step explanation:

Original price = x

Sale = 20% off

20% / 100 = 0.2 to convert from a percent to a decimal

Sale = x - 20% of x = x - 0.2x = 0.8x

Sale price = y = 0.8x

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Reduction = y - 25% of y = y - 0.25y = 0.75y

End price in terms of original price (x):

0.75y = 0.75(0.8)x

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End price = 0.6 or 60% of original price, coming out to a 100-60 = 40% overall percentage reduction

5 0
2 years ago
12. Three fifths of the children at my party like chocolate ice cream. How many of the 20 children at my party do not like choco
brilliants [131]

Answer:

12. if 3/5 of them like chocolate ice cream 2/5 don't and 2/5 of 20 is 8.

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5 0
3 years ago
the sum of two numbers is-5.When twice the first number is added to the second number the result is -2,find the two numbers
juin [17]

Answer:

Step-by-step explanation:

First write the question as an equation

x+y = -5

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From the given equations, we can create a third one.

x+y+2x+y = -7 or 3x+2y = -7

Use trial and error method for the possible values x and y

We know that at least one of these two have to be negative.

x can be 1, in which case y has to be 5.

Check this for

x+y ≠ -5

x can be -1

Try another one where x = -1 and y has to equal -2

Check this

X

x+y = -5

but,

2x+y ≠ -2

Another one,

8 0
2 years ago
Read 2 more answers
2.A spinner is divided into 20 equal sections. What is the probability of the spinner's pointer landing on section 5
lisabon 2012 [21]
I believe it's 1/20!

I hope this helps!
4 0
3 years ago
PLEASE HELP<br> What is the measure of ∠I? Explain.<br> Describe the relationship between ∠H and ∠L.
Llana [10]

The Relationship between Angle H and Angle L is that they are Corresponding Angles. Corresponding Angles are angles that equal to each other and are on the same side of the tranversal.

Sorry I don't know the answer to the first one without numbers. Hope that helped!

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2 years ago
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