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 Test Calculators and Practice Answers archive Word Problems Lessons In Depth

 Question 432964: Show that x^4 +(plus) 4 is prime only for one value of x,where x belongs to set of natural no.s Click here to see answer by robertb(4012)

 Question 433032: what is 3 to the tenth power divided by 3 to the second power? Click here to see answer by stanbon(57940)

 Question 432962: The positive integers p,q & r are all prime no.s if p^2-q^2=4,then find all posible values of r? Click here to see answer by richard1234(5390)

 Question 433029: A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current? Click here to see answer by Alan3354(31487)

 Question 433108: Mariah's lemonade is 45% lemon juice. Hector's lemonade is 90% lemon juice. How much of each solution will it take to make 60 liters of a 75% lemon juice mixture. A. 20 liters of 45% solution 40 liters of 90% solution B. 30 liters of 45% solution 30 liters of 90% solution C. 40 liters of 45% solution 20 liters of 90% solution D. 45 liters of 45% solution 15 litters of 90% solution Click here to see answer by rwm(914)

 Question 433275: Is cos^(-1) [cos (-pi/3)] = 1/2? Or is it - pi/3 since the functions are the same? (Cos and cos)? Click here to see answer by Alan3354(31487)

 Question 433327: How do you square the square root of -2? (-sqrt2)^2? Click here to see answer by stanbon(57940)

 Question 433347: What is exact value of sin^-1(cos 3pi/4)? I got the wrong answer so need to see a visual of how to do it the right way to know where I went wrong. Thank you! Click here to see answer by Alan3354(31487)

 Question 433358: How to do this problem: it says to multiply and simplify. (Sin(theta) + cos(theta))(sin(theta) + cos(theta)) -1/sin(theta)cos(theta) Click here to see answer by Alan3354(31487)

 Question 433423: The sum of the supplement and complement of an angle is 130 degrees. Find measure of the angle. Click here to see answer by stanbon(57940)
 Question 433423: The sum of the supplement and complement of an angle is 130 degrees. Find measure of the angle. Click here to see answer by dudeantariksh(10)

 Question 433434: How to establish this identity? Cos(theta)(tan(theta) + cot(theta)) = csc(theta) Which side do I work on the left? And how do I simplify it? Click here to see answer by Alan3354(31487)

 Question 433443: How does (sec + tan)(sec - tan)=1 come out to be sec^2 - tan^2 =1? Is it the pythagorean identities? Click here to see answer by Alan3354(31487)

 Question 433521: Suppose you are choosing between two long distance telephone plans. Plan A has a monthly fee of \$20 with a charge of \$0.05 per minute for all long distances calls. Plan B had a monthly fee of \$5.00 with charge of \$.10 per minute fr Long distances calls. 1. For what number of minutes of long distances calls will te cost for the two plans be same? What will be the cost for each plan? Click here to see answer by belle3833(46)

 Question 433420: A giant rectangle movie screen has a width 26 feet less than it's length. If it's perimeter is 332 feet, find the area of the screen. Click here to see answer by jorel1380(2518)

 Question 433514: The perimeter of a badminton court is 128 ft. After a game a badminton, a player's coach estimates that the athlete has run a total 444feet, which is equivalent to six times the courts length plus nine times it's width. What are the dimensions of a standard badminton court? Do not know how to start? Click here to see answer by scott8148(6628)
 Question 433514: The perimeter of a badminton court is 128 ft. After a game a badminton, a player's coach estimates that the athlete has run a total 444feet, which is equivalent to six times the courts length plus nine times it's width. What are the dimensions of a standard badminton court? Do not know how to start? Click here to see answer by jorel1380(2518)

 Question 433662: If x:y= 11:8 and y:z= 6:7, what is x:z? Click here to see answer by stanbon(57940)

 Question 433698: Explain how u can recognize a perfect-square trinomial when the coefficient of x squared is 1. What is the connection between the term and the last term? Click here to see answer by psbhowmick(529)

 Question 433820: a world globe is a sphere. the formula for the volume of a sphere is V=4pier^3/3 and the formula for surface area is SA=4pier^2. Part A. Write an expression for the ratio of the surface area of a sphere to its volume. Part B. Simplify the expression. Click here to see answer by psbhowmick(529)
 Question 433820: a world globe is a sphere. the formula for the volume of a sphere is V=4pier^3/3 and the formula for surface area is SA=4pier^2. Part A. Write an expression for the ratio of the surface area of a sphere to its volume. Part B. Simplify the expression. Click here to see answer by stanbon(57940)

 Question 433822: PLEASE HELP ME.!! Identify the matrix which represents the coordinates of triangle ABC where A(9, 6), B(3, 3), and C(0, 3) after a dilation with a scale factor of 2/3 Click here to see answer by shree840(260)

 Question 433873: I DONT UNDERSTAND THIS PLEASE HELP..! Use Cramers rule to solve for y in the following system of equations. x + 4y  2z = 3 x + 3y + 7z = 1 2x + 9y + z = 8 Click here to see answer by tlwright(1)

 Question 433875: HELP NEEDED..! Identify the slope-intercept form of the equation of a line which contains the points (2, 1) and (3, 4). Click here to see answer by stanbon(57940)

 Question 433952: Through which of the following points does the line y=-3/4x-6 Click here to see answer by Alan3354(31487)

 Question 433864: The time required to assemble computers varies directly as the number of computers assembled and inversley as the number of workers. If 30 co Liters can be assembled by 6 workers in 10 hours how long would it take 5 workers to assemble 40 computers? Click here to see answer by ankor@dixie-net.com(15745)

 Question 433995: X to the power of 3 minus 1000: factor the polynomial completely. Click here to see answer by Gogonati(817)

 Question 434011: 8a to the power of 3 minus 27b to the power of 3: factor the polynomial completely. Click here to see answer by Alan3354(31487)
 Question 434011: 8a to the power of 3 minus 27b to the power of 3: factor the polynomial completely. Click here to see answer by katealdridge(100)

 Question 434103: 11 divided by 10? Can you help me get my percentage Click here to see answer by Gogonati(817)