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lukranit [14]
4 years ago
8

Complete the table by providing justification for each step of the proof. Conjecture: If 4(x2 – 2) = 28, then x is 3 or –3

Mathematics
1 answer:
Anika [276]4 years ago
5 0
<span>4(x2 – 2) = 28
4x^2-8=28 Distributive law of multiplication

4x^2+8=28+8 Additive identity
4x^2=36 ; adding 8 to both sides
x^2 =9, dividing both sides by 4
x= +/- 3</span>
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Wilma has 21 coins in her pocket made up of dimes and quarters. If the total value of the coins is $3.45, how many of each coin
jeyben [28]

Answer:

x = 12

y = 9

12 coins of dimes

9 coins of quartes

Step-by-step explanation:

x  ---> coins of dimes

y  ---> coins of quartes

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0.1x + 0.25y =   3.45              * 100

  x +      y =   21   L1

10x + 25y = 345  L2

x = 21 - y

Reemplace in L2

10(21 - y) + 25y = 345

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Step-by-step explanation:

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2 years ago
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A building was planned to be built in an area north of 8th Street and east of Main Street, as shown below.
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3 years ago
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4 years ago
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