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VLD [36.1K]
3 years ago
5

Jessica is asked to write a quadratic equation to represent a function that goes through the point (8, –11) and has a vertex at

(6, –3). Her work is shown below. –11 = a(8 – 6)2 – 3 –11 = a(2)2 – 3 –11 = 4a – 3 –8 = 4a a = –2 After Jessica gets stuck, she asks Sally to help her finish the problem. Sally states that Jessica needs to write the quadratic equation using the value she found for a, –2, and the point (8, –11). Evaluate Jessica’s work and Sally’s review to determine which statement is true.
1. Jessica did not solve for the correct value of a, but Sally’s review is correct.
2. Jessica did not solve for the correct value of a, and Sally’s review is incorrect.
3. Jessica solved for the correct value of a, but Sally’s review was incorrect.
4. Both Jessica’s work and Sally’s review are correct. The equation is f(x) = –2(x – 8)2 – 11.
Mathematics
2 answers:
Lostsunrise [7]3 years ago
8 0

Answer:

Jessica’s work is correct and Sally’s review is incorrect

Step-by-step explanation:

I'm just assume it's a vertical parabola we know that The equation of a vertical parabola in vertex for is equal to where (h,k) is the vertex In this problem we have point substitute To find the equation using the value of a and the vertex point so therefore

Jessica’s work is correct and Sally’s review is incorrect

vesna_86 [32]3 years ago
5 0

the answer is c. I just did the review

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The amount of time that a customer spends waiting at an airport check-in counter is a random variable with mean 8.0 minutes and
strojnjashka [21]

Answer:

P ( 5 < X < 10 ) = 1

Step-by-step explanation:

Given:-

- Sample size n = 49

- The sample mean u = 8.0 mins

- The sample standard deviation s = 1.3 mins

Find:-

Find the probability that the average time waiting in line for these customers is between 5 and 10 minutes.

Solution:-

- We will assume that the random variable follows a normal distribution with, then its given that the sample also exhibits normality. The population distribution can be expressed as:

                                   X ~ N ( u , s /√n )

Where

                            s /√n = 1.3 / √49 = 0.2143

- The required probability is P ( 5 < X < 10 ) minutes. The standardized values are:

                        P ( 5 < X < 10 ) = P (    (5 - 8) / 0.2143 <  Z  <  (10-8) / 0.2143   )

                                                 = P ( -14.93 < Z < 8.4 )

- Using standard Z-table we have:

                        P ( 5 < X < 10 ) = P ( -14.93 < Z < 8.4 ) = 1        

7 0
3 years ago
35 POINTS PLEASE HELP
Lunna [17]

Answer:

The percentage error of measurement is 5.63 %

Step-by-step explanation:

Given as  :

The measure length of the fence = 150 feet

The actual length of the fence = 142 feet

Let the percentage error in measurement = x

So, x = \dfrac{\textrm measured value - \textrm actual value}{\textrm actual value} ×100

Or, x =  \dfrac{\textrm 150 - 142}{142} ×100

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4 0
3 years ago
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Jobisdone [24]

Answer: D: the point (0,0) contains the x-intercept

Step-by-step explanation:

4 0
3 years ago
Larry makes sandwiches for lunch everyday. he can make 5 sandwiches with every 3 tomatoes he buys. if he bought 9 tomatoes, how
tangare [24]
15 sandwiches
3 tomatoes= 5 sandwiches.
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15.





6 0
3 years ago
-10.2+c=-8.14<br> Helpppp
Oksanka [162]

Answer:

c=18.34

Step-by-step explanation:

6 0
3 years ago
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