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Unanswered: 50 problems
Expressions-with-variables/236333 (2009-11-08 00:33:52): Is 4 a solution to ½(y-2)+2=3/8(3y–4)
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Expressions-with-variables/236332 (2009-11-08 00:31:29): Is 4 a solution to ½(y-2)+2=3/8(3*y–4)
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Numbers_Word_Problems/236331 (2009-11-08 00:31:24): N is 80% of P
N to the root of 2 is what percent of P to the root of 2?
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Geometry_Word_Problems/236330 (2009-11-08 00:15:31): If a radius of a certain circle is tripled, with 8.2 centimeters then added,
the result is the circumference of the circle. Find the radius of the circle.
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Geometry_Word_Problems/236329 (2009-11-07 23:47:01): suppose that 18,000 is invested in two types of bonds for one year. Part of the money is invested in a high-risk, high growth fund that earned 24% annual interest. The rest is invested in a safe fund that earned 5% annual interest. If $2320 in interest is earned, how much was invested at each rate?
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logarithm/236328 (2009-11-07 23:46:45): Rewrite as an equivalent exponential equation. Do not solve
log10^0.000001 = 6
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Quadratic_Equations/236327 (2009-11-07 23:44:37): solve the quadratic equation by using the square root property.
4(a-5)^2=1
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Geometry_Word_Problems/236326 (2009-11-07 23:42:24): if
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logarithm/236324 (2009-11-07 23:23:55): Radioactive strontium 90Sr has been deposited in a large field by acid rain. If sufficient amounts make their way through the food chain to humans, bone cancer can result. It has been determined that the radioactivity level in the field is 1.7 times the save level S. 90Sr decyas according to the formula
A(t)=Aoe^-0.0239t
where Ao is the amount curretly in the field and t is the time in years. How many years will it take until the field is contaminated.
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Travel_Word_Problems/236323 (2009-11-07 23:18:37): A TRAIN TRAVELS 20 FEET IN IN 1/5 OF A SECOND, AT THE SAME SPEED HOW MANY FEET WILL IT TRAVEL IN 3 SECONDS?
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Linear_Equations_And_Systems_Word_Problems/236322 (2009-11-07 23:14:40): how do you convert 4 1/8 pounds to ounces.
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Numeric_Fractions/236321 (2009-11-07 23:02:38): factor 15 x to the 3rd- 5x
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Mixture_Word_Problems/236320 (2009-11-07 22:59:47): a motor boat travels 36km down stream in 2 hours . in coming back up streams, the
trip takes 3 hours. find the rate of the boat in still water and the rate of the current.(solve using linear system)
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Equations/236253 (2009-11-07 18:18:57): If a piece of aluminum with a mass of 37.6 grams and a temperature of 100.0 degrees Celsius was dropped into 25.0 cm^3 of water at 20 degrees Celsius, what would the final temperature be?
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logarithm/236126 (2009-11-07 09:07:09): Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Show your work. Use the resulting ordered pairs to plot the graph. State the equation of the line asymptotic to the graph (if any).
y = -3 to the x power
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Linear-systems/236123 (2009-11-07 08:52:41): what is the answer and working out to - solve the following linear equations simultaneously 4x+4y=5 and 2y=2x-5
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Number-Line/236122 (2009-11-07 08:50:07): I need help explaining multiplying and dividing negative numbers using the number line. Does the answer jump to the right of zero or or does it stay on the left and is reported as an absolute number.
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Graphs/236118 (2009-11-07 08:21:30):
a-On a graph draw the triangle with vertices (-2,0), (0,2) and (2,-2)
b-Find the three inequalities that define the region inside the triangle.
c- What is the smallest integer value of x that satisfies all three inequalities?
Please draw the triangle and explain me everythong in detail so that I may understand. The answer for part b should be y-2 and for part c it should be y=-1.
Thank you very very much!!
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Miscellaneous_Word_Problems/236104 (2009-11-07 05:05:29): on a 100-questions test, 60 questions involve algebra and 20 questions are difficult. if 8 of the difficult questions involve algebra , how many of the questions that are not difficult do not involve algebra?
a) 92 b) 80 c) 52 d) 28 e)12
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Expressions-with-variables/236103 (2009-11-07 05:03:42): in the expression w/x - y/z = 1 the letters can be replaced by the numbers (1,2,3,4) but not necessarily in that order. the sum of w and y is
a) 3 b) 4 c) 5 d) 6 e) 7
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Problems-with-consecutive-odd-even-integers/236100 (2009-11-07 04:19:55): What is the smallest integer that could be part of a set of two or more positive consecutive integers whose sum is 100?
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Percentage-and-ratio-word-problems/236099 (2009-11-07 04:18:59): A unit fraction is a fraction whose numerator equals one. The sum of three different positive unit fractions is 6/7. Find the smallest number that could be the sum of the denominators of these fractions.
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Numbers_Word_Problems/236098 (2009-11-07 04:18:14): The average of 12 different counting numbers is 12. What is the greatest possible value of one of these numbers?
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Miscellaneous_Word_Problems/236097 (2009-11-07 04:10:25): Kris spikes his hair using gel. If he uses 4 mL of gel every day for 20 days and 3 mL every day after that, how many days total will it take him to empty a 128 mL tube of gel?
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Numbers_Word_Problems/236096 (2009-11-07 04:07:29): A new school has exactly 1,000 lockers and exactly 1,000 students. On the first day of school, the students meet outside the building and agree on the following plan: The first student will enter the school and open every locker. The second student will then enter the school and close every even number locker. The third student will then reverse every third locker (3,6,9.....). If the locker is closed the student will open; if open, he or she will close it. The fourth student will then reverse every fourth locker and so on until all 1,000 students in turn have entered the building and reversed the proper lockers. In the end, which lockers finally remain open?
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Graphs/236092 (2009-11-07 02:33:58): why the log function graph doesn't go negative?
what will be the graph of 1/((x^2)-5x+6)?
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Linear-systems/236084 (2009-11-07 01:22:17): Suppose Bob owns 2,000 shares of Company X and 10,000 shares of Company Y. The total value of Bob's holdings of these two companies is $340,000.
Suppose Frank owns 8,000 shares of Company X and 6,000 shares of Company Y. The total value of Franks holdings of these two companies is $340,000.
a. Write equations for Bob and Frank's holdings. Use the variables X and Y to represent the values of shares of Company X and Company Y.
b. Solve for the value of a share of Company X and Company Y. Show your work so you can get partial credit even if your final answer is wrong.
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Linear-systems/236083 (2009-11-07 01:20:30):
3. Solve for X, Y, and Z in the following systems of three equations:
a. X + Y + 2Z = 5
X + Y = 5
X + 3Y + Z = 11
b. X + 10Y + Z = 52
5X + Y + 4Z = 15
X + 2y - 3Z = 12
c. 22X + 5Y + 7Z = 12
10X + 3Y + 2Z = 5
9X + 2Y + 12Z = 14
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Linear-systems/236082 (2009-11-07 01:17:49): Solve for X and Y in the following problems. .
a. X + Y=7 , X + 2Y = 11
b. 3X + 7Y = 24, 9X + 5Y = 24
c. 4X + Y = 17, 2X + 3Y = 21
d. 18X + Y = 42, 6X - 3Y = -6
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Mixture_Word_Problems/236081 (2009-11-07 01:07:50): Suppose an exam has 28 questions on it and students need to answer 18 of the questions. How many ways can this be done if the first 5 and last 4 questions must be answered and question #19 must not be answered because of a typo?
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Trigonometry-basics/236070 (2009-11-06 23:16:37): Simplify the trigonometric expression.
cos(x)/(tan(x)+sec(x))
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Polynomials-and-rational-expressions/236068 (2009-11-06 23:10:01): simplify by removing factors of 1
48u^8z^9/18u^2z^3
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Points-lines-and-rays/236061 (2009-11-06 22:36:46): Write each of the following as a single transformation.
A rotation about O by 90° counterclockwise, followed
by a rotation about O by 30° clockwise.
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Radicals/236059 (2009-11-06 22:34:39): I really need help simplify these four questions:
2 square root 36x to the 16th power
2 square root 8z to the 6th power
3U2 square root 20y to the 3rd power + y 2 square root 80 yU to the 2nd power
2 square root 3x to the 5th power w to the 5th power 9x to the 4th power w to the 5th power
Thank you so much!
^_^
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Geometry_proofs/236053 (2009-11-06 21:40:59): Given: O is the midpoit of line NP, angle N is congruent to angle P Prove: line SO is congruents to line OR
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Mixture_Word_Problems/236047 (2009-11-06 20:55:21): We are mixing 50 gallons of a 20 % acid solution with 60 gallons of a 30 % acid solution.
Determine the percent concentration in the resulting solution?
How many millilitres of 20 % acid solution should be added to 500 millilitres of 40 % acid solution to prepare ointment that is 35 % acid?
How many litres of water should be added to 35 litres of 65 % salt solution to prepare 40 % salt solution?
What is the percent concentration of sugar in the resulting mixture of 200 grams of sugar and 350 grams of serving that is 25 % sugar?
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Linear-equations/236046 (2009-11-06 20:50:30): In the United States, 200 million gallons of used motor oil is improperly disposed of each year. One gallon of used oil can contaminate one million gallons of drinking water. How many gallons of drinking water can 200 million gallons of oil contaminate? Express the answer in scientific notation.
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Matrices-and-determiminant/236038 (2009-11-06 20:08:25): I have to evalute the determinant of the matrix problem: -40, -1089052
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Equations/236035 (2009-11-06 20:05:15): can you help me factor
4x^3+4x^2y-24xy^2
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Miscellaneous_Word_Problems/236030 (2009-11-06 19:26:30): A merchant mixes tea that sells for 7.20/kg and tea that sells for 9.20/kg to make 100kg of tea that he sells for 8.80/kg. how many kilograms of each type of tea did he mix?
Also, it has to be solved with either the substitution or elimination method.
Thanks.
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Finance/236026 (2009-11-06 19:06:17): Bill just graduated from college and started work with a base pay of $22,000. Each year Bill receives a 5% raise.
Assume that the cost of living due to inflation goes up 4% each year.
a) Write the equation that shows what Bill's $22,000 starting salary inflation must increase to as the years go by just to keep up with inflation.
b) What salary after 30 years would be equivalent in buying power to Bill's starting salary?
c) In how many years after retirement will Bill's fixed yearly income be equivalent, after accounting for inflation, to his starting salary?
I don't really get what they are asking for:( Please help. Thanks!
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Miscellaneous_Word_Problems/236023 (2009-11-06 18:58:44): Sally is building a box with a square base for her ant
colony. The bottom of the box and all four sides are con-
structed of glass costing $1/ft2, and the top is to be con-
structed of glass costing $5/ft2. Sally has $72 to spend on
the box. How should she choose the dimensions so that the
volume of the box is greatest?
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Numbers_Word_Problems/236022 (2009-11-06 18:58:03): The cost C to poduce X number of skateboards is C=100 + 20x. The skateboards are sold wholesale for $24 each, so the revenue R is given by R=24X. Find how many skateboards the manufacturer needs to produce and sell to break even?
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Pythagorean-theorem/236020 (2009-11-06 18:54:07): could i answer a pythagorean theorem question with 26 square roots of 85
?
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Numbers_Word_Problems/236017 (2009-11-06 18:51:35): a youth organization collected nickels and dimses for a charity drive. by the end of the 1 day drive, the youth had collected %56.35. If there were three times as many dimes as nickels, how many of each type of coin was collected?
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Graphs/236015 (2009-11-06 18:47:58): Evaluate the exponential equation for three positive values of x, three negative values of x, and at x=0. Show your work. Use the resulting ordered pairs to plot the graph. State the equation of the line asymptotic to the graph (if any).
y = 3^(x - 4)
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Graphs/236014 (2009-11-06 18:45:49): Evaluate the logarithmic equation for three values of x that are greater than -1, three values of x that are between 0 and -1, and at x = -1. Show your work. Use the resulting ordered pairs to plot the graph. State the equation of the line asymptotic to the graph (if any).
y = log base 1/7^(x+2)
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Polynomials-and-rational-expressions/236013 (2009-11-06 18:44:42): I am supposed to solve:
(x+14)(x-14)(x+10)>0
I am given three options for choosing an answer: a solution set x = ?,
the solution is all real numbers, or there is no solution
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Square-cubic-other-roots/236009 (2009-11-06 18:33:30): Multiply:
(3 sqrt 3- 9 sqrt 6)(2 sqrt3 + 6 sqrt 6)
I don't understand the textbook examples.
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Problems-with-consecutive-odd-even-integers/236008 (2009-11-06 18:29:37):
The product of two consecutive positive odd integers is one less than three times their sum. Find the integers.
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