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

Tutors Answer Your Questions about Evaluation Word Problems (FREE)

Question 604288: eigth times a number minus six times the same number
Click here to see answer by flame8855(424)

Question 605207: You are in a lobby of a house. There are three switches all in the off position. Upstairs, there is a room with a lightbulb that is turned off. One and only one of three switches, controls the bulb. you want to discover which controls the bulb, but your are only allowed to go upstairs once.How do you do it?
Click here to see answer by bucky(2189)

Question 605722: jimmy is a partner in an internet based coffee supplier. The company offers gourmet coffee beans for $11 per pound and regular coffee beans for $7 per pound. Jummy is creating a medium price product that will sell for $9 per pound. The first thing to go into the mixing bin was 10 pounds of the gourmet beans. how many pounds of the less expensive regular beans should be added?
Click here to see answer by nerdybill(7384)

Question 607473: The product of two whole numbers is 196. If one number is four times the other number, what are the numbers?
Click here to see answer by richwmiller(17219)

Question 609603: You have 15 coins in your pocket all quarters and dimes. They total up to $3.15. How many quarters do you have? How many dimes do you have?
Click here to see answer by solver91311(24713)

Question 609682: Write a mathematical sentence that expresses the information given below Use d as your variable name If necessary: Jake began the day with 88 dollars in his wallet. Then he deposited some money into the bank from what was in his wallet. After doing that, he had 23 dollars in his wallet.
Click here to see answer by solver91311(24713)

Question 610445: The aquarium has a variety of fish in the 9,000 gallon tank. In the first tank there are 5 more Moorish Idol fish than there are Mandarin fish. The sum of fish in the tank is 53. How many Mandarin fish are there? Moorish Idol fish?
Click here to see answer by flame8855(424)

Question 610778: If x= 2+√3 and y=2-√3 the the value of 1/x^2 + 1/y^2 is ?
Click here to see answer by solver91311(24713)

Question 611785: two numbers have a product of 45 and a difference of 12, what are these two numbers?
Click here to see answer by Alan3354(69443)

Question 612338: the spanish class was having a fiesta for the end of the year and they ordered tacos from a local restaurant. The tacos cost $.60 each and the enchiladas cost $1.25 each. They ordered 15 more than enchiladas and the total bill was $64.50. how many of each did they order?
Click here to see answer by josmiceli(19441)

Question 612965: Write the logarithmic equation in exponential form.
log12144 = 2
Click here to see answer by jim_thompson5910(35256)

Question 613069: in a 10-kilometer race, there are 112 more men entered than women. Find the number of female runners if the total number of runners in the race is 600
Click here to see answer by stanbon(75887)

Question 613732: The half-life of carbon-14 is 5700 years. Find the age of a sample at which 40% of the radioactive nuclei originally present have decayed
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Question 613733: Rene is going to the lake to visit some friends. If the lake is 60 miles away, and Rene is driving at 40 miles per hour the entire time, how long will it take her to get to the lake?
Click here to see answer by Alan3354(69443)

Question 613929: If a stone is tossed from the top of a 170 meter building, the height of the stone as a function of time is given by h(t) = -9.8t^2 � 10t + 170, where t is in seconds, and height is in meters. After how many seconds will the stone hit the ground? Round to the nearest hundredth�s place; include units in your answer.
please this is the only problem I need help with. I just don't understand!
Click here to see answer by josmiceli(19441)

Question 615387: hello sir, i need your help for this question..
jim is reviewing his algebra quiz. he is very sure that one of his solutions is incorrect. which one?
Click here to see answer by Alan3354(69443)

Question 615979: The Missouri Football Stadium is 12 3/4 inches from the Columbia Regional Airport on a map with a representative fraction of 1 : 100,000. How many miles apart are they.???
Click here to see answer by JBarnum(2146)

Question 616370: A water balloon is dropped from a cliff. Exactly. Exactly 3 sec. later, the sound of the balloon hitting the ground reaches the top of the cliff. How high is the cliff?
Click here to see answer by Alan3354(69443)

Question 616788: I need a few good word problems for Substitution and elimination for practice.
Click here to see answer by richwmiller(17219)

Question 616890: A group of 3 children and 2 adults pay
a total of $120 to take a karate class.
A group of 5 children and 1 adult take
the same karate class for $95. What is
the total cost for 1 child and 1 adult to
take the karate class?
Click here to see answer by richwmiller(17219)

Question 617394: 12. Which set is infinite?
{x | x âˆˆ N and x < 20}
{x | x is an improper fraction}
{3, 5, 7, . . ., 99}
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Click here to see answer by jim_thompson5910(35256)

Question 618355: what is the value of the variable x and y in:
x-9y=-13
y=-x+7
Click here to see answer by mananth(16946)

Question 618539: in checking records finds that crew A can pave a contract length of highway in 8 hours. Crew B can do the same job in 10 hours. how long would it take if they worked together?
Click here to see answer by scott8148(6628)

Question 618862: A rock-climbing gym charges nonmembers $18 per day
to use the wall plus $7 per day for equipment rental. Members pay an
annual fee of $400 plus $5 per day for equipment rental. How many days
must both a member and a nonmember use the wall in one year so that
both pay the same amount?
Click here to see answer by stanbon(75887)

Question 619590: Convert each number to the specified base. Be sure to include the base when needed.
Express 2713(8) in base 10 ________

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Question 619591: Convert each number to the specified base. Be sure to include the base when needed.
Convert 283 to base 5 ________

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Question 619594: Convert each number to the specified base. Be sure to include the base when needed.
Convert 659 to base 4 ________

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Question 620191: A variable a varies jointly as b and the square of c and inversely as d. When a= -14, b=5, c=8, and d=20. Write the equation to represent this variation. Then find a when b=4, c=6, and d=9.
Click here to see answer by vleith(2983)

Question 620500: In order to test a new production method, 36 employees were selected randomly to try the new method. The mean was 75.79 parts per hour with a standard deviation of 28.25 parts per hour.
What is the sample size needed to obtain a margin of error 14.01 with a 90% confidence interval?

Click here to see answer by ewatrrr(24785)

Question 623150: Please help me solve this word problem of variation. The volume rate of flow R of blood through an artery varies directly as the fourth power of the radius r of the artery and inversly as the distance d along the artery. If an operation is successful in effectively increasing the radius of an artery by 25% and decreasing its length by 2%, by how much is the volume rate of flow increased?
Click here to see answer by Alan3354(69443)

Question 623839: A inch rope is cut into two pieces. If one piece has a length of inches, what is the length, in inches, of the other piece?
Click here to see answer by math-vortex(648)

Question 624369: find two numbers whose some is 163 such that when the larger number is divided by the smaller number, the quotient is 3 and the remainder is 3.

Click here to see answer by lwsshak3(11628)

Question 624558: Seven times what number is 1596?
Click here to see answer by jim_thompson5910(35256)

Question 624558: Seven times what number is 1596?
Click here to see answer by lenny460(1073)

Question 624581: The sum of two numbers is 12. The difference between the square of the larger number and the square of the smaller number is 24. Find these two numbers.
Click here to see answer by oscargut(2103)

Question 624956: 5y(y^3-4y+2)
Click here to see answer by jim_thompson5910(35256)

Question 624954: 2x�2x�
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Question 624954: 2x�2x�
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Question 627399: if i have 12' abs pipe want cut 3 pices one at 33 3/8 and seccon at 56 5/8 and tird at 39 7/8 the saw at 1/8 what got left

Click here to see answer by Alan3354(69443)

Question 628041: Grandma gave some baseball cards to Richey and some to Erin. She gave 4 times the amount to Erin than she gave to Richey. If the total amount she gave to both was 325 cards, how many cards did she give to Richey?
Click here to see answer by reviewermath(1029)

Question 631176: Geologists estimate that the continents of Europe and North America are drifting apart at a rate of an average of 12 miles every 1 million years, or about 0.75 inch per year. If the continents continue to drift apart at that rate, how many inches will they drift in 50 years?

Click here to see answer by ewatrrr(24785)

Question 632422: The electrical charge on a metal plate is given by the function below, where t is the time in seconds. What is the charge after 10 seconds?
c(t)=12e^-t/5
Click here to see answer by Alan3354(69443)

Question 632423: The electrical charge on a metal plate is given by the function below, where t is the time in seconds. What is the charge after 10 seconds?
c(t)=12e^-t/5
Click here to see answer by Alan3354(69443)

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