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Tutors Answer Your Questions about Evaluation Word Problems (FREE)
Question 459368: in a bacterial culture, the number b of bacteria present is modeled by b=15000e^0.3t, where t represents times in hours since 12:00 noon.
a. how many bacteria will be present at 5:00pm ?
b. how long will it take for there to be over 120000 bacteria?
Click here to see answer by nerdybill(6948)   |
Question 459404: hello,
Can someone help with this question
The height of building is 1332 ft how long would it take for an object to fall to the ground from the top. Use the s= 16t^2, where s is the distance, in feet, traveled by an object falling freely from rest in t seconds. Thank you
Click here to see answer by stanbon(57224) |
Question 459448: K & S Construction, located in Phoenix, Arizona, is working on its business plan for the upcoming year. They did a study to determine if they should focus on building condominiums or individual houses. A building study, which had been conducted by the state, indicated that 60 percent of those families looking to buy a home in Arizona desired to buy a condominium. K & S Construction wanted to know if this figure applied to Phoenix. They collected a sample of 500 individuals that had expressed plans to buy a new home. The z-distribution was selected for this proportion test. The null hypothesis is p = 0.60 and the alternate is p ≠ 0.60. The significant level selected was .05. From the sample of 500, it was determined that 290 wanted to buy a condominium. What decision should be made regarding the null hypothesis?
A. Fail to reject it
B. Reject it
C. The test level of .05 is not acceptable
D. Cannot accept nor reject it based on the information given
Click here to see answer by edjones(7569)  |
Question 459636: you provide great, can someone help me with these problems
Find all x intercepts of the given f(x) =-9sqrt x + 18
____________________________________________________________
Find the quadratic equatioin that fits the following set of data points
((3,66),(-4,38),(-1-10))
Thank you
Click here to see answer by stanbon(57224) |
Question 459653: I have one more from yesterday, I am still stuck, please help.
Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form ax^2+bx+c=0, where a,b,and c are integers(no fractions) solution -3/4,9/4. Thank you.
Click here to see answer by sudhanshu_kmr(1152)  |
Question 459665: Hello,
Can someone help me with this question. The answer is supposed to be in pairs, but I keep coming up with the wrong answer. The problem that I need help with is:
Find all x-intercepts of the given f(x). f(x)=x-9 sqrt x+18.
Thanks in advance for your help.
Click here to see answer by solver91311(16868)  |
Question 459697: The length of a rectangle is 2 meters less than three times the width. What is the maximum integer value of the length if the perimeter is less than 43 meters?
A. 5 meters
B. 13 meters
C. 15 meters
D. 16 meters
Click here to see answer by nerdybill(6948) |
Question 459720: PLEASE HELP THE OTHER ANSWER I GOT TO THIS QUESTION WAS WRONG HERES THE PROBLEM:
one number is six more than the second number. Five times the first is 7 less than 4 time the second number. Find the FIRST AND SECOND NUMBER.
THANK YOU SO MUCH FOR YOUR HELP ;)
Click here to see answer by Alan3354(30968)  |
Question 459816:
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--------------- QUESTION FOLLOWS --------------------------
if 4 -3a=7-2(2a+5) evaluate a^2+7a
Please I NEED HELP
(-2x^3+x-1)-(-x^2+x-3)
(2x^2+5x-3)-(3x^3+2x-5)
a ship traveling east at 25mph is 10mi from a harbor when another ship leaves the harbor traveling east at 35mph. How long does it take the second ship to catch up.?
Click here to see answer by mananth(12270)  |
Question 459834: My last question, please help
Write a quadrataic equation in the variable x having the given numbers as solutions. Type the equation in standard form ax^2+bx+c=0 where a,b, and c are integers(no fractions) solutions -2/3,7/3
Thank you
Click here to see answer by stanbon(57224) |
Question 459943: I'm 46 yrs old and am trying to refresh algebra.
When the digits of a 2-digit number are reversed, the new number is 9 more than the original number, and the sum of the digits of the original number is 11. What is the original number?
Click here to see answer by MathLover1(6617)  |
Question 459943: I'm 46 yrs old and am trying to refresh algebra.
When the digits of a 2-digit number are reversed, the new number is 9 more than the original number, and the sum of the digits of the original number is 11. What is the original number?
Click here to see answer by richwmiller(9135)  |
Question 459933: I'm 46 and trying to refresh my skills
How would I solve the following:
The amount of money that a salesperson makes varies directly as the total amount of sales made. If the salesperson receives 7,500 for selling a house for 120,000, how much will he make if he sells a house for 150,000?
Click here to see answer by rfer(12646) |
Question 459936: I;m 46 and refreshing my algebra, help??? please
Jim has a total of 50 coins. Some are nickels and some are dimes. Altogether he has 4.15. How many dimes does he have and how many nickels?
Thanks
Click here to see answer by rfer(12646) |
Question 460028: Construction utilizes the Pythagorean Theorem in many instances to insure a “square” structure. In laying out the footers or corners of any building the concept of a 3-4-5 right triangle is applied.
(1)Name two more dimensions of a right triangle that will also yield a square corner and justify.
Click here to see answer by oberobic(2304) |
Question 459941: I have a question about height, please help
The height of a building is 1582 ft. How long will it take an object to fall to the ground from the top. Use the s= 16t^2, where s is the distance, in feet, traveled by an object falling freely from rest in t seconds. Thank you
Click here to see answer by ankor@dixie-net.com(15625)  |
Question 460089: Today's question, please help
A one compartment vertical file is t be constructed by bending the long side of an 8in by 16 in plastic along two lines to form a U shape. How tall should the file be to maximize the volume that it can hold. My answer was 5in is that correct?, if not, please help me with this. Thanks
Click here to see answer by Alan3354(30968) |
Question 460186: I have this word problem that driving me nuts, the answer I got was forty inches and I know that can't be right? Can someone help me?
This is the problem:
Economite Plastics plans to produce a one-compartment vertical filey by handling the long side of an 8-in by 16 in. sheet of plast along two lines to form a U shape. How tall should the file be in order to maximize the volume that the file can hold?
Thanks
Click here to see answer by Alan3354(30968) |
Question 460201: Carbon dioxide (CO2) is a greenhouse gas in the atmosphere that may raise average temperatures on Earth. The burning of fossil fuels could be responsible for the increased levels of carbon dioxide. If current trends continue, future concentrations of atmospheric carbon dioxide in parts per million (ppm) could reach the levels shown in the accompanying table. The CO2 concentration in the year 2000 was greater than it had been at anytime in the previous 160,000 years.
Year 2000 2050 2100 2150 2200
CO2(ppm) 364 467 600 769 987
a) Let x be in yrs, where x=0 corresponds to 2000, x=1 to 2001, and so on. Find values for C and a so that f(x)=Ca^x models the data.
b) Graph f and the data in the same viewing rectangle.
c) Use f(x) to estimate graphically the year when the carbon dioxide concentration will be double the preindustrial level of 280 ppm.
This is a difficult one. Please assist me with this.
Thank you in advance Raven
Click here to see answer by stanbon(57224) |
Question 460144: I have a word problem, I cannot figure out, please help
Snookers lumber can converg logs into either lumber or plywood. In a given day the mill turns out twice as many units of plywood as lumber. It makes a profit of $25 on a unit of lumber and $50 on a unit of plywood. How many of each unit must be produced and sold in order to make a profit of $12,625.
Click here to see answer by ankor@dixie-net.com(15625) |
Question 460352: Can someone help me, I am having trouble with this word problem
In 1990, the life expectancy of males in a certain country was 68.4 years 71.7 years. Let E represent the life expectancy in year t represent the number of years since 1990. The linear equarion E(t) that fits that data is E (t)= __+__
round to the nearest tenth/
Thank you
Click here to see answer by stanbon(57224) |
Question 460356: A ball is thrown vertically upward from the top of a building 96feet tall with an initial velocity of 80feet per second. The distance S (in feet )of the ball from the ground, after t seconds is s=96+80t-16tsquard.
(a)After how many seconds does the ball strike the ground?
(b) After how many seconds will the ball pass the top of the building on its way down?
Click here to see answer by Alan3354(30968) |
Question 460485: Hard problem, please help!
Suppose that for a certain company c(x)=45x+300,000 represents the total cost function and R(x)=65x represents the total revenue function. find the total profit and break even point.
a) 20x+300,000
b) 20x-300,000
c) 110 x+300,000
break even point is____,_____
Thank you
Click here to see answer by stanbon(57224) |
Question 460594: I am re-submitting this question, I sent it in this morning and got no response, please help!!
The question was: A physician advised her patient to take 0.475 mg tablets of a medicine each night for 13 night. Determine the amount of the medication the patient ingested during that time in milligrams and in micrograms
The patient ingested__mg of medicine
The patient ingested__mcg of medicine
Thank you
Type an integer or a decimal.
Click here to see answer by Alan3354(30968) |
Question 460479: Hello, I am resubmitting this question. I did not receive an answer.
Tough word problem, the answer does not look right, the answer I have is 39,000.
The questions is this:
The number of files N of the same size that a computer's hard disk will hold varies inversely as the size of S of the files. Greg's hard disk will hold 1300 files if each is 12,000 bytes long. How many files of each is 120,000 bytes long. How many files will the disk hold if each is 40,000 long?
Click here to see answer by ankor@dixie-net.com(15625) |
Question 460355: Tough word problem, answer to this does not look right, I have 39,000.
The question is this:
The number of files N of the same size that a computer's hard disk will have varies inversely as the size S of the files. Greg's hard disk will hold 1300 files if each is 120,000 bytes long. How many files of each is 120,000 bytes long. Ho many files will the disk hold if each is 40,000 bytes long.
I don't think I have the right answer.
Thanks
Click here to see answer by robertb(4012)  |
Question 460855: The length of a rectangle is 2 meters less than three times the width.
What is the maximum integer value of the length if the perimeter is less than 43 meters?
A. 5 meters
B. 13 meters
C. 15 meters
D. 16 meters
Could someone please help me with this problem and go over step by step with me?
I believe the answer is 5 meters because it is the only solution which the perimeter is less than 43 meters...??? HELP!!!
Click here to see answer by amoresroy(333)  |
Question 460980: Help please.
A carpenter is building a rectangular room with a fixed perimeter of 160ft. What dimensions would yield the maximum area. What is the maximum area?
The length that would yield the maximum area is ___________feet, the width is___
The maximum area is ______sq feet
Thanks
Click here to see answer by rwm(914) |
Question 460980: Help please.
A carpenter is building a rectangular room with a fixed perimeter of 160ft. What dimensions would yield the maximum area. What is the maximum area?
The length that would yield the maximum area is ___________feet, the width is___
The maximum area is ______sq feet
Thanks
Click here to see answer by JimboP1977(308)  |
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