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professor190 [17]
4 years ago
15

I need help with all of them

Mathematics
1 answer:
lara [203]4 years ago
6 0
Click on the picture! This is the explanation in accident I deleted it hope it helps!

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Prove that the value of the expersion y^2-10y+30 can only be a positive number
sergeinik [125]

Answer:

  • See below

Step-by-step explanation:

  • y² - 10y + 30 =
  • y² - 10y + 25 + 5 =
  • (y - 5)² + 5

<u>Since (y - 5)² ≥ 0, the expression above is positve:</u>

  • (y - 5)² + 5 ≥ 5
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3 years ago
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Josie surveyed a random sample of 100 student at her school about their favorite teacher.There are 1500 student in the school.Th
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Answer:

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Step-by-step explanation:

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In November 2010 the average cost of 5 gallons of regular unleaded gasoline in the United States was $14.46. What was the averag
Svetach [21]

Answer:

$46.72

Step-by-step explanation:

The first step is to find the price of 1 gallon

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1 gallon= x

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x= 14.46/5

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Therefore the cost of 16 gallons of gasoline can be calculated as follows

1 gallon= 2.92

16= x

x= 2.92 × 16

= $46.72

6 0
3 years ago
4x107 is times as much as 4x103 10^4 10^10 4x10^10 4x10^4
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Answer

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Step-by-step explanation:

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The length of a rectangle is 3 cent. less than four times it’s width. it’s area is 10 sq cent.
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Answer:

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Step-by-step explanation:

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