Questions on Word Problems: Evaluation, Substitution answered by real tutors!

Tutors Answer Your Questions about Evaluation Word Problems (FREE)

Question 54422: Instructions: Write eac phrase as a numerical expression. Use "n" as a number.
question 29. seven less than five times a number
Click here to see answer by funmath(2925)

Question 56203: three of the house numbers on a street are consecutive odd integers. their sum contains three consecutive digits such that the middle digit is equal to the sum of the other two. find the three house numbers on the street
Click here to see answer by stanbon(57984)

Question 57557: The time is now 12:00 PM. When is the next time the clock hands will be on top of each other?
Click here to see answer by rcmcc(152)

Question 58355: The upper Angel Falls, the highest waterfall on Earth, are 750 m higher than Niagara Falls. If each of the falls were 7m lower, the upper Angel Falls would be 16 times as high as Niagara Falls. How high is each waterfall?
Click here to see answer by ankor@dixie-net.com(15747)

Question 58433: Supppose 2000 bacteria are present at time t=0. Then t minutes later, the number of bacteria present will be (N)t=2000(2)^t/40
Find the number of bacteria present after 20 and 120 minutes.
Round to the nearest whole number for each one.
Click here to see answer by Nate(3500)

Question 58858: A patient is to receive 420mL of fluid over a 7hour period from a drip machine:
(a) What is this rate in millilitres per minute (mL/min)?
(b) If the drip machine delivers medicine at the rate of 60 drops per mililitre, how many drops per minute will be neeced to deliver the medicine in the correct time?
Click here to see answer by rcmcc(152)

Question 59622: A company uses the formula C(x) = 0.02x2 – 3.4x + 150 to model the unit cost in dollars for producing stabilizer bars. For what number of bars is the unit cost at its minimum? What is the unit cost at that level of production?
Click here to see answer by funmath(2925)

Question 60230: A ball is thrown vertically upward from the ground with an initial speed of 80 ft/sec. Its height is given by h = 80t - 16t2. How high does the ball go? When does the ball hit the ground?
Click here to see answer by funmath(2925)

Question 60595: Please me with this equation Simp[lify sqrt(75a^2) My answer is 0 is this corrrect. thanks for all that you do.
Click here to see answer by jai_kos(139)

Question 60637: 1. When 3 dice are rolled, how many ways can the sum of 6 be obtained?

2. In building new homes, a contractor finds that the probability of a homeowner selecting a 2 car garage is .70 and of selecting a 1 car gagage is .20. Find the probability that the buyer will select no garage. The builder does not build houses with garages of 3 or more cars.

Click here to see answer by consc198(59)

Question 60646: Ace auto Rental rents cars for $10 a day and 10 cents for every mile driven. McGuire Rental rents cars for $24 a day with unlimited mileage. How many miles per day can you drive an Ace Auto Rental car if it is to cost you less than a mcGuire Rental car?

Could you please help me

Allison

Click here to see answer by checkley71(8403)

Question 60747: This is so complicated the sum of two numbers is 77 The second is 5 times more than 3 times the first.What are the two numbers? I do not understand
Click here to see answer by checkley71(8403)

Question 60640: 1. At a campus club meeting, there are 6 seniors, 4 juniors and 3 sophmores. If a committee of 4 students is selected at random, find the probability that it will consist of 2 seniors, 1 junior, and 1 sophmore.

Click here to see answer by brandonpark2889(31)

Question 60647: an ivestment of $4400 is made into a 10.5% annual simple interest account. How much money is deposited into a 8% annual simple interest account if the total annual interest earned on both accounts is 9% of the total investment.
Click here to see answer by josmiceli(9819)

Question 60942: If jess has 3 more nickels than dimes and she has 1.50. How much of each coins does she have?
Click here to see answer by joyofmath(189)

Question 60967: Sally bought three chocolate bars and a pack of gum and paid $1.75. Jake bought two chocolate bars and four packs of gum and paid $2.00. Find the cost of a chocolate bar and the cost of a pack of gum.

Click here to see answer by checkley71(8403)

Question 61357: ISBN 1 902 214 13X - Essential Mathematics Book 8 - David Rayner
The height of a balloon increases at a steady rate of x metres in t hours. How far will the balloon rise in one hour? How far will the balloon rise in 4 hours?
Click here to see answer by funmath(2925)

Question 61842: One person can devote 24 hours a week to a project and two others can each devote 30 hours a week to the same project. If the total project requires 420 hours to complete, how many weeks will it take?
Click here to see answer by brandonpark2889(31)

Question 61843: One person can devote 24 hours a week to a project and two others can each devote 30 hours a week to the same project. If the total project requires 420 hours to complete, how many weeks will it take?
Click here to see answer by uma(370)

Question 62427: A model for the number of people N in a college community who have heard a rumor is: N= P*(1-e^-0.15d)
where P is the total population of the community and d is the number of days that have elasped since the rumor began. In a community of 10,000 students, how many students will have heard the rumor after 3 days?
Click here to see answer by funmath(2925)

Question 62553: AN OBJECT IS PROJECTED UPWARD FROM THE TOP OF A TOWER. ITS DISTANCE IN FEET ABOVE THE GROUND AFTER t SECONDS IS GIVEN BY s(t)=-16t2+64t+80. HOW MANY SECONDS WILL IT TAKE TO REACH THE GROUND?
Click here to see answer by funmath(2925)

Question 63529: 3 guys walk into a hotel. The clerk tells them that it will be thirty dollars for the room. they each pay 10 dollars. The clerk then tells them that they are having a special and it is only twenty five dollars for the room. The clerk gives that bellboy five single dollar bills. the bellboy took two. What happened to the extra dollar.
Click here to see answer by Edwin McCravy(8999)

Question 63560: .the area of a square bookcase is 21 more than the perimeter. find the length of a side
Click here to see answer by joyofmath(189)

Question 63715: The width of a rectangle is one-third the length. The perimeter is 48cm. Find the length and width.

Click here to see answer by checkley71(8403)

Question 63714: Jonathan has $7.00 in nickels, dimes, and quarters. He has twice as many dimes as nickels, and 3 times as many quarters as nickels. He has 42 coins altogether. How many of each coin does he have?
Click here to see answer by checkley71(8403)

Question 63712: Each of the equal sides of an isosceles triangle is 5cm greater that the base. The perimeter is 46cm. What is the lengh of each of the sides of the triangle?
Click here to see answer by checkley71(8403)

Question 63711: A full-grown giraffe is about 6 times heavier that a full-grown lion. A full-grown cheetah is about one-quarter as heavy as a full-grown lion. Together, they are about 450kg. What is the approximate mass of each animal?
Click here to see answer by checkley71(8403)

Question 63765: If the greatest common factor of "a" and "b" is 3, what values are possible for the greatest common factor of a2 and b
Click here to see answer by tanimachatterjee(60)

Question 65416: thanks so much for helping me, guys!...i am almost finished with this unit, but unfortunately i am stumped again. imagine you are serving a volleyball underhanded. suppose you hit the ball when it is 3 feet above the ground, and it leaves your hand with an initial upward velocity of 20 feet per second.
general formula for height: H=-1/2*gt^+vt+h where g is the acceleration due to gravity, and on the earth, equals 32ft/sec^. v is the initial upward velocity of the object and h is the initial height above the ground.
the question is: what is the maximum height that the volleyball will reach and how many seconds will it take to reach this height?
Click here to see answer by funmath(2925)

Question 65900: To find the image length, L, of a 4-foot-tall object in a spherical mirror with a focal length of 2 feet, L=4(2/o-2)^2 can be used, where o is the distance, in feet, of the object from the mirror. What is the image length of the object when is is 1.5 feet away from the mirror?
Answer Choices:
A) 256 feet
B) 128 feet
C) 64 feet
D) 32 feet
Click here to see answer by stanbon(57984)

Question 65937: Louie borrowed $525.00 to buy some stereo speakers. The store charges 7.03% simple interst. How much interest will Louie owe if he borrows the money for 2 years?
Answer Choices:
A)$36.91
B)$73.82
C)$74.68
D)$369.08
Click here to see answer by stanbon(57984)

Question 66087: D = C-S/n (for s)
Click here to see answer by checkley71(8403)

Question 66385: Your test score are 75, 93, 90, 82, and 85. What is the lowest score you can obtain on the next test to achieve an average of at least 86?
Click here to see answer by ankor@dixie-net.com(15747)

Question 66941: Two cargo trains leave the train depot at the same time and are going in the same direction. One travels at 60 miles per hour, and the other travels at 45 miles per hour. Which system of equations could you use to find how long it will take for the trains to be 75 miles apart?
Answer Choices:
A) t=45d
t=60(d+75)
B) d=45t
d+75=60t
C) d=45t-75
d=60t
D) d=45(t+75)
d=60t
Click here to see answer by ptaylor(2052)

Question 67486: one 3rd of x minus 5 how is this written out ??

Click here to see answer by lladiedii(1)

Question 67535: There are 850 Douglas fir and ponderosa pine trees in a section of forest bought by Sawz Logging Co. The company paid an average of $300 for each Douglas $217,500 for the trees, how many of each kind did the company buy?
Click here to see answer by ptaylor(2052)

Question 67532: Martina leaves home at 9 a.m., bicycling at a rate of 24 mi/h. Two hours later, John leaves, driving at the rate of 48 mi/h. At what time will John catch up with Martina?
Click here to see answer by ptaylor(2052)

Question 67531: A bus leaves a station at 1 P.M., traveling west at an average rate of 44 mi/h. One hour later a second bus leaves the same station, traveling east at a rate of 48 mi/h. At what time will the two buses be 274 mi apart?
Click here to see answer by venugopalramana(3286)

Question 67761: Ms. Jordan has been given a loan of $2500 for 1 year. If the interest charged is $275, what is the interest rate on the loan?
Click here to see answer by tutorcecilia(2152)

Question 67758: Paul invested $5000 in a time deposit. What interst will he earn for 1 year if the interest rate is 6.5%?
Is the answer $325.00
Click here to see answer by tutorcecilia(2152)

Question 67887: If the total bill at a resturant, including a 15% tip, is $65.32, what was the cost of the meal alone?
Click here to see answer by tutorcecilia(2152)

Question 67885: The electricity costs of a business decreased from $12,000 one year to 10,920 the next. What is the rate of the decrease?
Click here to see answer by tutorcecilia(2152)

Question 67884: A survey of 400 people found that 66 were left-handed. What percent of those surveyed were left-handed?
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