Mathematics High School

From 1999 to 2000, the number of days of unhealthy air quality in Charlotte, North Carolina, dropped from 5 to 2. Find the percent of decrease in the number of days of unhealthy air.


A.
15%


B.
6%


C.
1.5%


D.
60%

Answers

Answer 1
Wait let me see here
Answer 2

Answer: it’s D which is 60%, hope it helps

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16 by 8

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7

Step-by-step explanation:

3(a)+1 A=2

3(2)+1

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7

Step-by-step explanation:

We need to input the values of "a" into the equation.

1) 3 x 2 + 1

So 3 x 2 = 6 and plus one is 7.

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Answer: equation Y as in 3/4x +1?

Step-by-step explanation:

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1 3

- , -

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..

..

..

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........

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circumphrence

Step-by-step explanation:

Answer:

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Step-by-step explanation:

4/5 ÷ 1/2 – 3/4 × 3/5( these are fractions)

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Answer:

23/20 or 1  3/20  or  1.15

Answer:

1 3/20

Step-by-step explanation:

3x^2- 10x - 8 please help with this

Answers

So why I now yes when she where it go to get the stuff
b^2 - 4xaxc
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(-10)^2 -4 x3 x (-8)

100 + 96

196

Sqrt(196) = 14

x1 = (-b-sqrt(196))/2a
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x2 = (-b+sqrt(196))/2a
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if y=3 when x=4, find y when x=6

Answers

Answer:

y = 2

Step-by-step explanation:

(x)(y) = k    Inverse relationship

(4)(3) = k

12 = k

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y = 2

Answer:

Step-by-step explanation:

Ebony is x years old.
Her brother is 4 years older.
Her Mum is 3 times her age.

Write an expression for the age of:
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Her brother

Answers

Answer:

Ebony's brother is x + 4 years old.

Ebony's mum is 3x years old.

Explanation:

Since Ebony is x years old, and her brother is 4 years older than her, the expression is x + 4, as her brother is +4 years older.

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Price - $375
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Total =

Answers

Answer: 20

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Amy scores 7760 points on a new game, to the nearest 10.
Bill scores 7700 points to the nearest 100.
Who did better?
Amy
Bill
Can't tell

Answers

Answer:Bill

Step-by-step explanation:

Because Bill scored to the nearest 100

Answer: Amy

Explanation: Bill’s score has to be 7749-7700 for it to be rounded by the nearest hundred and get 7700. While Amy’s would have to be anywhere from 7755-7760 for it to be rounded by the nearest ten and get 7760.

How do I do this please help

Answers

Answer:

A

Step-by-step explanation:

is the answer Aaaaaaaaa

what's the opposite of -4

Answers

Answer:

4

Step-by-step explanation:

It's a opposite of -4 so the opposite would be 4

Answer:

4

Step-by-step explanation:

The opposite of -4 is 4

In addition

The absolute value of -4 is also 4

Therefore, the answer is 4.

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Answer:

0

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

You have to show the dropdown to be able to answer exactly what they are looking for as an answer.

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Answer:

45

Step-by-step explanation:

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Answer:

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Answers

Answer:

1)

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2)

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Step-by-step explanation:

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Martin ordered a pizza with a 12-inch diameter. Ricky ordered a pizza with a 16-inch diameter. What is the approximate difference in area of the two pizzas in

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OB. 16

O C. 112

O D. 352

Answers

Answer:

88 in²

Step-by-step explanation:

The shape of a pizza = Circular

Area of a circle = πr²

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Martin ordered a pizza with a 12-inch diameter.

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Micah has 15 games. Micah has three more games than kelly. Kelly has K number of games. Move values into the boxes to create an equation to represent this senerio

Answers

Answer:

Equation = K + 3 = 15

K = 12 games

Step-by-step explanation:

According to the scenario, calculation of the given data are as follows,

Micah games = 15

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As Micah has three more games than Kelly, then

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A doctor's office schedules 15 minutes for each patient and a half hour for the doctor's lunch at 11:30 a.m. If the doctor started work at 9:00 a.m. and followed this
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O 20
O 22
O 24
O 26

Answers

9514 1404 393

Answer:

  24

Step-by-step explanation:

If we reschedule the doctor's half-hour break so that s/he quits work at 3:00 pm, s/he will have worked 6 straight hours from 9 am to 3 pm. Seeing 4 patients each hour, the doctor will have seen ...

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The doctor saw 24 patients by 3:30 pm.

The highway mileage (mpg) for a sample of 9 different models of a car company can be found below.

33 38 48 34 21 24 26 23 26


Find the mode:


Find the midrange:


Find the range:


Estimate the standard deviation using the range rule of thumb:


Now use technology, find the standard deviation:

Answers

Answer:

34

Step-by-step explanation:

because I did the test

Answer:

34

Step-by-step explanation:

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Answer:

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at a concession stand three hotdogs in for hamburgers cost $13.50 for hotdogs and three hamburgers cost $12.75 find the cost of one hotdog and find the cost of one hamburger

Answers

Price of Hotdogs you do 14.50/3= 4.50
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Answers

Answer:

96%

hope this helps!!:)

Step-by-step explanation:

Answer:

I think the question is supposed to be What is 25% of 24? Or you are missing a component of the question

Step-by-step explanation:

You could multiply .25 times 24 to get the answer because changing 25% to a number you can use in an equation means adding a decimal place and moving two places to the left.

.25 x 24= 6

6 is 25% of 24

Rewrite the fraction in the sentence below as a percentage.
19
At a certain wedding,
of the guests were under 65 years old.
20

Answers

Answer: 95%

Step-by-step explanation:

19/20 divide

=0.95 turn into fraction form

= 95/100

=95%

If 85% of dentists recommend Crest toothpaste, what percent do not recommend Crest?

Answers

Answer:

15%

Step-by-step explanation:

100% - 85% = 15%

2/3x - 12 for x = 18___

Answers

Answer:

-11 53/54

Step-by-step explanation:

3 x 18 = 54

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