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Yakvenalex [24]
3 years ago
9

The air quality index, or AQI, measures how polluted the air is in your city and assigns a number based on the quality of the ai

r. Over 100 is unhealthy. . . Given the following quadratic regression equation, estimate the number of days the AQI exceeded 100 in the year 1988. . . n = 1.76t^2 - 13.32t + 41.00. (let t represent the number of years since 1990. therefore, t = 0 corresponds the year 1990. round to the nearest whole day.). . A. 60 days. B. 75 days. C. 61 days. D. 21 days
Mathematics
2 answers:
vaieri [72.5K]3 years ago
7 0
There are several information's already given in the question. The answer to the question can be easily deduced using those given information's. 

From the given question we come to know that
t = -2
Then
n = 1.76t^2 - 13.32t + 41.00
   = [1.76 * (-2)^2] - [13.32 * (-2) + 41
   = 7.04 - ( - 26.64) + 41
   = 7.04 + 26.64 + 41
   = 74.68
   = 75
From the above deduction, we can conclude that the correct option among all the options that are given in the question is the second option or option "B".
Eva8 [605]3 years ago
5 0

Answer:

b. 75 days

Step-by-step explanation:

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A meuseum added 18 painting to its collection in may. This is 20% of paintings the meuseum has in April. How many paintings did
Alexus [3.1K]

18 / x = 20 / 100

20x = 1800

x = 90

The museum had 90 paintings in April.

Hope this helps!! :)

5 0
3 years ago
Cayden wants to buy a television that costs $600, including taxes. To pay for the television, he will use a payment plan that re
kobusy [5.1K]

well, the regular cost of the TV is 600 bucks, that includes taxes already, so is just 600 flat.

the payment plan makes Cayden pay 225 first, leaving 375 for periodic payments for 6 months, each payment of 74.50.

well, 74.5*6 = 447, so Cayden is paying 225 + 447 = 672, so the increase is 72 bucks.

If we take 600 to be the 100%, how much is 72 off of it in percentage?

\begin{array}{ccll} amount&\%\\ \cline{1-2} 600&100\\ 72&x \end{array}\implies \cfrac{600}{72}=\cfrac{100}{x}\implies \cfrac{25}{3}=\cfrac{100}{x} \\\\\\ 25x=300\implies x=\cfrac{300}{25}\implies x=12

7 0
2 years ago
You need to buy some chicken for dinner tonight. You found an ad showing that the store across town has it on sale for $2.79 a p
san4es73 [151]

Answer:

B) Going to the close store is cheaper.

Step-by-step explanation:

Cost of going to the next town:

(8.3mi/22mi) × $3.79 = $1.43

Cost of going to the close store:

(2.3mi/22mi) × $3.79 = $0.40

3 0
3 years ago
If two angles have the same angle measure, then they are said to be____.
Sergio [31]

Answer:

C

Step-by-step explanation:

2 equal angles are said to be congruent

4 0
2 years ago
Read 2 more answers
Question
meriva

Question:

In a neighbourhood pet show, each of the animals entered is equally likely to win. if there are 7 dogs, 6 cats, 3 birds, and 2 gerbils entered, what is the probability that a bird will win the top prize?

Answer:

Probability that a bird will win the top prize is 0.167

Step-by-step explanation:

Given:

The number of  dogs  = 7

The number of  cats = 6

The number of  birds  = 3

The number of gerbils = 2

To Find:

Probability that a bird will win the top prize = ?

Solution:

Let us first find the total number of  pets .

The Total number of pets = 7 + 6 + 3  + 2 =  18

Now the probability of  a bird will win the top prize is

=> \frac{\text {Number of birds}}{\text{ Total number of pets}}

=>\frac{3}{18}

=> \frac{1}{6}

=>0.167

4 0
3 years ago
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