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

Tutors Answer Your Questions about Evaluation Word Problems (FREE)

Question 824042: I need mire detail solution (and explanation what formulas should be used):
Evaluate A = (a^2 − 3a +1)^2 − (1− a)(−2a +1)(1− 3a)
Click here to see answer by Pumps(3)

Question 824043: I need mire detail solution (and explanation what formulas should be used):
A Nintendo DS costs one hundred and twenty British pounds sterling (�120). I decide today, 17th
April 2013, to put 10p aside. Tomorrow I�ll put 15p, the day after 20p, the day after that 25p and
so on, increasing the amount by 5p every day. At which date will I have enough to buy the
Nintendo?
�1 = one pound = 100 pennies = 100p
Click here to see answer by stanbon(75887)

Question 824047: Along with incomes peoples charitable contributions have steadily increased over the past years. The table below shows the average deduction for charitable contributions reported on individual income tax returns for the period 2007 to 2012. Find the average rate of change between 2009 and 2011.
Year. Contribution
2007 $1980
2008 $2350
2009 $2490
2010 $2760
2011 $3060
2012 $3120
Click here to see answer by TimothyLamb(4379)

Question 824314: I need more detail solution:
A girl has orange, yellow and red sweets. She has exactly twice as many red than yellow sweets.
After eating fourteen orange sweets, she has two less orange than yellow sweets. Also, the
number of orange sweets now are 20% of the total number of sweets she had at the beginning.
How many sweets did she have at the beginning?
Click here to see answer by stanbon(75887)

Question 824397: I need detail solution (and explanation what formulas should be used):
A Nintendo DS costs one hundred and twenty British pounds sterling 12000 pennies . I decide today, 17th
April 2013, to put 10 pennies aside. Tomorrow I�ll put 15 pennies, the day after 20 pennies, the day after that 25p and
so on, increasing the amount by 5 pennies every day. At which date will I have enough to buy the
Nintendo?
Click here to see answer by richwmiller(17219)

Question 824392: I need detail solution:
A = ( + + )( − + ) and B = ( + − )(− + + ) find C=AB
(In the "A" I've got 4-2, but I can't solve B)
Click here to see answer by rothauserc(4718)

Question 824396: I need a detailed solution:
In a test the average grade of each boy is 60 points and the average grade of each girl is 80 points. The total number of points of the class is 580. If each boy had a 10% higher
grade and each girl had a 10% lower grade then the whole class would have a total which is 32
points less than before. How many are the boys in this class?
Click here to see answer by richwmiller(17219)

Question 824394: I need more detail solution and explanation:
If 3x+y-2z=7 and x-y-2z=5, find the value of 4x+2y-2z
Click here to see answer by richwmiller(17219)

Question 824543: Solve the problem.
The half-life of plutonium-234 is 9 hours. If 70 milligrams is present now, how much will be present in 6 days? (Round your answer to three decimal places.)
Answers:
A) 0.689
B) 44.096
C) 0.001
D) 23.091
Click here to see answer by TimothyLamb(4379)

Question 825044: Roger has twice as many sweets a dan. If Roger gives dan 5 sweeets he will have 5 more sweets than Dan. How many sweets does Dan have?
Click here to see answer by TimothyLamb(4379)

Question 825569: find an equation of variation in which y varies directly as x and y=18 when x=9. then find the value of y when x=16
Click here to see answer by richwmiller(17219)

Question 825908: Find a number such that 7 added to twice this number is 76
Click here to see answer by Seutip(231)

Question 825986: There is an animal farm where chickens and cows live. All together, there are 53 heads and 174 legs. How many chickens and how many cows are there on the farm?
P.s you can just give me atleast 2 equations, that would really help even if you dont put solutions :) I would be using elimination method.
Click here to see answer by josmiceli(19441)

Question 826437: A rectangle is 5cm longer than its wide. If the length and breadth are increased by 2cm each, the area increases by 50cm2. FInd the dimensions of the original rectangle
Click here to see answer by josgarithmetic(39614)

Question 826559: A boy had a box containing a total of 8 spiders and beetles. He counted 54 legs altogether. Find how many of each were in the box (spiders have 8 legs and beetles have 6 legs).
Click here to see answer by Edwin McCravy(20054)

Question 827350: if the 1st,2nd and 3rd digits are all the same. together they form a 3-digit number that is 70 less than the square of the product of the first two digits. what is the 3-digit number?
Click here to see answer by ankor@dixie-net.com(22740)

Question 828307: You and your friend are selling raffle tickets for a new laptop. You sell 14 more tickets than your friend sells. Together, you and your friend sell 58 tickets.
a. Write a system of linear equations that represents this situation.
b. How many tickets do each of you sell?
Click here to see answer by TimothyLamb(4379)

Question 829162: There are 27 campers.This is nine times as many as the number of counselors.How many counselors are there?

Click here to see answer by colt9715bass(1)

Question 829240: A test has 20 questions worth 100 points. The test consists of true and false questions worth 3 points each and multiple choice questions worth 11 points each. How many true and false and multiple choice questions are on
the test
Click here to see answer by TimothyLamb(4379)

Question 829327: y is 3 less than twice a number x
Click here to see answer by erica65404(394)

Question 829532: Classify each number below as an integer or not.
integer
-46 yes or no
24/3 yes or no
16.61 yes or no
-59 yes or no
-17/14 yes or no

Click here to see answer by LinnW(1048)

Question 829718: A rectangular field will be fenced on all four sides. Fencing for the north and south sides costs $9 per foot and fencing for the other two sides costs $8 per foot. What is the maximum area that can be enclosed for $4800?
Click here to see answer by josmiceli(19441)

Question 830318: This is my word problem:
Catherine bowled 150 and 196 on her first two games. What will she have to bowl on her third game to have an average of 201?
Click here to see answer by Fombitz(32388)

Question 830349: x+3/3x+3 divide by x-3/x^2+3x+2 simplify your answer as much as possible
Click here to see answer by Fombitz(32388)

Question 830722: A new cruise ship line has just launched 3 new ahips; the Pacific Paradise, the Caribbean Paradise, and the Mediterranean Paradise. The Caribbean Paradise has 13 more deluxe staterooms than the Pacific Paradise. The Mesitterean Paradise has 40 fewer deluxe staterooms than four times the number of deluxe staterooms on the Pacific Paradise. Find the number of deluxe staterooms for each of the ships if the total number of deluxe staterooms for the three ships is 615
Click here to see answer by JulietG(1812)

Question 831028: "A chemist wants to make 250 liters of a 27% salt solution by combining a barrel containing a 15% salt solution and another barrel containing a 65% salt solution. How many liters does he need from each barrel?"
Thank you so much! x
Click here to see answer by josgarithmetic(39614)

Question 831029: "A boat travels upstream traveling 18 miles in 6 hours and downstream in 2 hours. What is the speed of the boat as well as the rate of the current?"
Thank you so much! x
Click here to see answer by mananth(16946)

Question 831967: four times a number minus twice another number is -16. the sum of the two numbers is -1. find the numbers?
Click here to see answer by JulietG(1812)

Question 834183: Two plane leave NAIA airport at the same time. One travels north at 680mph and the other travels south at 620mph. How long will it take for the two planes to be 3900miles apart?
Click here to see answer by ankor@dixie-net.com(22740)

Question 834480: The average of 8 numbers is 15, four of these numbers are 21,5,6, and 12. what is the average of the other four numbers?
Click here to see answer by JulietG(1812)

Question 834614: I really need help I cannot understand this.
between 0 degree C and 30 degree C the volume V (in cubic centimeters) of 1kg of water at a temperature T is given by the formula.
V=999.87-0.06426T+0.0085043T^2-0.0000679T^3
Find the temperature at which the volume of 1 kg of water is a minimum.
thank you!
Click here to see answer by josgarithmetic(39614)

Question 835772: 5 times a number added to the same number all divided by 3 = 24
Click here to see answer by Fombitz(32388)

Question 837220: help me set up equation and solve.
A farmer grows only sunflowers and flax on his 240-acre farm. This year, he planted 80 more acres of sunflower than of flax. How many acres of each crop has he planted?
Click here to see answer by LinnW(1048)

Question 839299: The sum of 3 numbers is 2.
the first number minus the second plus the third is -2.
The first minus the third is 2 more than the second.
Find the numbers. I am so lost.
Click here to see answer by ewatrrr(24785)

Question 839303: One canned juice drink is 20% orange juice, another is 5% orange juice.
How many liters of each should be mixed together in order to get 15L that is 9% orange juice. I've done this problem over and over and Im not getting the right answer. Please help my understand. Thank YOu
Click here to see answer by ewatrrr(24785)

Question 839945: A Candy store sells red jelly beans and blue jelly beans Caden buys 8 ounces of red and 4 of blue jelly beans for a total of $20. Tovah buys 6 ounces of red and 9 of blur jelly beans for a total of $27. What is the cost per ounce for red and blue jelly beans?
Click here to see answer by josgarithmetic(39614)

Question 840622: six more than a number is 12
Click here to see answer by Fombitz(32388)

Question 840878: There are 3 boxes of returns to be loaded on a truck, weighing 10 lbs., 5 lbs., and 15 lbs., respectively. What is the average weight of the boxes?
Click here to see answer by Fombitz(32388)

Question 841912: A cashier has a total of 30 bills, made up of ones, fives, and twenties. The number of twenties is 9 more than the number of ones. The total value of the money is $351. How many of each denomination of bills are there?
Must write 3 equations from the word problem and solve the system of equations using either the substitution or elimination method showing all work.
Click here to see answer by richwmiller(17219)

Question 842936: Bob has enough fertilizer to cover 320ft^2 of garden space. How wide is the largest circular garden that Bob can fertilize. Use 3.14 for Pie
Click here to see answer by josgarithmetic(39614)

Question 842973: solve this the current i in a circuit is inversely proportional to its resistance R measured in ohms. suppose that when the current in a circuit is 30 amperes the resistance is 8 ohms. find the current in the same circuit when the resistance is 10 ohms
Click here to see answer by Alan3354(69443)

Question 843008: the difference of a number and -5 is negative 15
Click here to see answer by mathhelper123(14)

Question 843459: Together, Huey, Dewey and Louie earn 72, 000 a month. If Huey earns 6,000 more than Dewey and 9,000 more than Louie, how much does Huey earn?
Click here to see answer by hamsanash1981@gmail.com(151)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915