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n200080 [17]
3 years ago
9

PLEASE HELP !!! ILL GIVE BRAINLIEST!! *DONT SKIP* ILL GIVE 40 POINTS.

Mathematics
2 answers:
juin [17]3 years ago
5 0

Answer:

5.5

Step-by-step explanation:

The <em>rate of change</em> of a relationship is the <em>ratio of corresponding changes in value</em>. Symbolically, we indicate a change with the greek letter Δ (pronounced "delta"). A <em>change in x</em> is written Δx ("delta eks") and a <em>change in y</em> is written Δy ("delta why"). We're looking for the ratio Δy/Δx ("delta y over delta eks").

Mathematically, Δx and Δy are the <em>differences</em> between two corresponding x an y values. To pick these, we can take any two rows in our table. Let's pick rows 4 and 2, nice whole numbers:

\Delta{x}=20-10=10\\\Delta{y}=112-57=55\\\Delta{y}/\Delta{x}=55/10=11/2=5.5

We can confirm that this holds for every other pair, too - picking rows 2 and 1 as an example:

\Delta{x}=10-5=5\\\Delta{y}=57-29.5=27.5\\\Delta{y}/\Delta{x}=27.5/5=275/50=11/2=5.5

svet-max [94.6K]3 years ago
4 0

Answer:

5.5

Step-by-step explanation:

57-29.5 / 10-5 = 5.5

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A sample of restaurants in a city showed that the average cost of a glass of iced tea is $1.25 with a standard deviation of 7¢.
jek_recluse [69]

Answer:

The tea's actual cost is $116.25

Step-by-step explanation:

* Lets revise how to find the z-score

- The rule the z-score is z = (x - μ)/σ , where

# x is the score

# μ is the mean

# σ is the standard deviation

* Lets solve the problem

- The average cost of a glass of iced tea is $1.25

- The standard deviation of it is 7 cents

- A new restaurant charges a price for iced tea that has a

 z-value of -1.25

* Lets change the average cost to cent

∵ $1 = 100 cents

∴ The average cost of a glass of iced tea = 1.25 × 100 = 125 cents

∵ z = (x - μ)/σ

∵ z = -1.25

∵ μ = 125

∵ σ = 7

∴ -1.25 = (x - 125)/7 ⇒ multiply both sides by 7

∴ -8.75 = x - 125 ⇒ add 125 to both sides

∴ 116.25 = x

* The tea's actual cost is $116.25

6 0
3 years ago
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Nat2105 [25]

Answer:

we are going to place 2 at the place where x is

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5 is your answer I believe

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half of 18 is 9

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