Math

The amount of background noise is important to television news reporters. One station developed the formula
N = -r^2 + 12t + 54 showing the noise level in decibels (N) as it relates to the time after the speaker stops talking in seconds (t). How many seconds after the speaker stops will the noise level be the greatest? Write and tell how you decided.

1. 👍 0
2. 👎 0
3. 👁 144
1. T=4 then N=86
T=5 then N=89
T=6 then N=90
T=7 then N=89
T=8 then N=86

We see that N is maximum when t=6

OR.....

The maximum will be at the vertex of the graph. You can get the t coordinate by taking:
-b/2a
= -12/(2*-1)
= -12/-2
= 6
The max is at 6 seconds.

1. 👍 0
2. 👎 0

Similar Questions

1. Math

You’re involved in the design of a new facility. It is important for people to move between work stations quickly. Based on the figure below, how many feet would a person need to walk to get from Work Station 1 to Work Station

asked by Tammie on September 9, 2016
2. geometry

Lenny’s favorite radio station has this schedule: news: 15 min. commercials: 3 min. music: 42 min. If Lenny chooses a time of day at random to turn on the radio to his favorite station, what is the probability that the news will

asked by tamara on October 22, 2013
3. Math Data management

A survey of 1000 television viewers conducted by a local television station produced the following data: •40% watch the news at 12:00 •60% watch the news at 18:00 •50% watch the news at 23:00 •25% watch the news at 12:00

asked by Rania on January 19, 2011
4. data management

A survey of 1000 veiwers conducted by a television station produced the following data: 40% watched the news at 12:00 60% watched the news at 18:00 50% watched the news at 23:00 25% watched at 12:00 and 18:00 20% watched at 12:00

asked by kim on November 6, 2011
5. EdTech

1) what is an example of bias in media A. A website that presents a controversial opinion as though it were fact. B. A television news program that presents both sides of a particular issue**** C. A podcast expressing an authors

asked by Hukuna Matata on February 10, 2015
1. Hypothesis - Statistics

At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal

asked by Vivian on July 28, 2012
2. Math

A canadian television station shows 16 mins of commercials every hour between 8am and 11pm everyday. How many minutes of commercials are there on the station between 8 am and 11 pm in 365 days?

asked by Mike on May 12, 2017
3. social studies

1. On-the-scene coverage of a natural disaster is an example of the press’s role of a. watchdog. b. signaler. c. partisan advocate. d. common-carrier. e. interpreter. 2. The news media are usually guided by events that a. are

asked by Anonymous on October 8, 2010

What is an example of bias in media? a.) a website that presents a controversial opinion as though it were fact b.) a television news program that presents both side of particular issue

asked by Alexia on February 20, 2014
5. Managerial Economics

A television station is considering the sale of promotional DVDs. It can have the DVDs produced by one of two suppliers. Supplier A will charge the station a set-up fee of \$1200 plus \$2 for each DVD; supplier B has no set-up fee

asked by BJ on December 19, 2009
6. Language Arts 8A

Please help me by checking these answers. It would really help me because I need to get my grade up. I star my answers. 1. When MacNeil asks, "When before human history has so much humanity collectivity surrendered so much of its

asked by Emmy on November 3, 2014