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sergejj [24]
3 years ago
5

PLEASEEEE I NEED HELP!!!! Find k in the following arithmetic sequence: 4k-k^2, 3k, k

Mathematics
1 answer:
LenaWriter [7]3 years ago
3 0
 3k - (k-2) = (k-2) - (k+7) 3k = (k-2) - (k+7) + (k-2) 3k = 2(k-2) - (k+7) 3k = 2k - 4 - k - 7 3k = k - 11 2k = -11 
k = -5.5
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Find xy if x + y=3, x^2 + y^2 = 5
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Answer:

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Step-by-step explanation:

x+y=3

x=3-y

putting the value of x

in this

x²+y²=5

(3-y) ²+y²=5

9-6y+y²+y²=5

2y²-6y+9-5=0

2y²-6y+4=0

2y²-4y-2y+4=0

2y(y-2)-2(y-2)=0

(2y-2) (y-2) =0

2y-2=0 or y-2=0

y=1 or y=2

so x=2 or 1

so x×y=2×1 or 1×2=2

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8 0
3 years ago
find the nonpermissible replacement for the variable x in this expression (x^2)/(2x-4) ? find the nonpermissible replacement for
Tcecarenko [31]
<span>The nonpermissible replacement for the variable x in this expression is x = 2


Substituting x = 2 yields:


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5 0
3 years ago
a party rental company has chairs and tables for rent. the total cost to rent 3 chairs and 2 tables is $26. the total cost to re
Alexus [3.1K]
Let the cost of renting a chair be x and for renting a table be y than 5x + 3y = 31 and 2x + 6y = 52 2x+ 6y = 52 can be further simplified to x + 3y = 26 now try solving for x and y... best of luck:D
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3 years ago
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IL MARK AS BRAINLIEST REAL EASY QUESTION‼️‼️‼️‼️‼️
qaws [65]

Answer:

Step-by-step explanation:

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5 0
3 years ago
Out of a total of 2,000 boxes, 40% were red. 50% of the red boxes were sold. a. How many red boxes were sold? Answer: _____ b. H
Natalija [7]

Answer:

400 red boxes were sold

Step-by-step explanation:

Step 1: Our output value is 2000.

Step 2: We represent the unknown value with x.

Step 3: From step 1 above,2000=100%.

Step 4: Similarly, x=40%.

Step 5: This results in a pair of simple equations:

2000=100%

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Step 6: By dividing equation 1 by equation 2 and noting that both the RHS (right hand side) of both

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Therefore, 40% of 2000 is 800

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3 0
3 years ago
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