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 Test Calculators and Practice Answers archive Word Problems Lessons In Depth

 Question 210730: how many 4 inch by 8 inch bricks are needed to build a walk 6 ft wide and 24 feet long? Click here to see answer by Earlsdon(6294)

 Question 210718: DJ Joe wants to organize 127 CD’s into storage boxes. Each storage box can hold a maximum of 10 CD’s. What is the least number of storage boxes needed? (1) 10 (3) 12 (2) 11 (4) 13 Click here to see answer by Earlsdon(6294)

 Question 210928: Tany saved a dollor in the first month. She saved b dollors in the second month. The money she saved the third month was the sum of money that she saved in the first and second month.the money she saved in the fourth month was the sum of the money she saved in the second and third months and so on. If she had saved \$280 in the ninth month, rhat were the values of a and b given that they were whole numbers? Click here to see answer by Theo(3504)

 Question 211094: a) For the quadratic equation kx^2 + 2x + 4 = 0, find the value of k so that the roots are equal (there is only one root). b) The roots of x^2 + (k + 8)x + 9k = 0 are equal. What are the value(s) of k? Click here to see answer by ankor@dixie-net.com(15746)

 Question 207961: Evaluating a ratioal expression, can you help me with this, -2x -8 X2+2x-8 Click here to see answer by rapaljer(4667)

 Question 190146: What is the slope of a binomial 2x+3? Click here to see answer by rapaljer(4667)

 Question 211553: 1.6,4.8,5.2,x find x if the mean is 3.7 Click here to see answer by rfer(12730)

 Question 202666: Given U = {21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31}, A = {21, 23, 25, 27, 29}, and B = {22, 25, 28, 29}. Find A′ U B′. Click here to see answer by HyperBrain(694)

 Question 204550: Hi there, I have an exam today and I was doing a practise exam where I came across this question and was unable to solve it. Could one of the tutors please help me with it, I'd be more than grateful!!!! Scientists have 50g of a radioactive element that decomposes with a half-life of 15 seconds. (3 marks:1 mark each) a) Write an equation that predicts the amount of the element remaining as a function of time. b) How much of the element would remain after 2 minutes? c) How long would the element take to decompose to the point where there is only 0.01g remaining? Click here to see answer by nerdybill(7008)

 Question 212132: The value of a car varies according to the formula: V = 20,000e^-(t/12) where V is the value in £'s and t is its age in years from new. a) State its value when new. b) Find its value (to the nearest £) after 4 years. c) Sketch the graph of V against t. Click here to see answer by Fombitz(13828)

 Question 212825: The students at King High School are in grades 9, 10, 11, and 12. Of all of the students, 1/4 are in grade 9, 1/3 are in grade 10, and 1/6 are in grade 11. If there are 300 students in grade 12, how many are in grade 11? Click here to see answer by stanbon(57967)

 Question 213148: What is 5.814 and 23.238 in radical form? I forgot how to convert it. Click here to see answer by drj(1380)

 Question 213257: Find three consecutive odd numbers such that the difference of five times the third number and three times the first number is 54. Separate your answers with a comma. No space between all inputs. Click here to see answer by checkley77(12569)

 Question 213339: if i purchased \$45.40 worth of petrol at \$1.49 pre litre how many litres did i buy? Click here to see answer by Earlsdon(6294)

 Question 213467: A pitcher can throw a baseball 95 miles per hour. The ball travels at that speed for 56 feet, until it arrives at the batter. How many seconds, correct to the nearest thousandth of a second, does the batter have from the moment the ball is thrown, until it arrives. Click here to see answer by josmiceli(9817)
 Question 213467: A pitcher can throw a baseball 95 miles per hour. The ball travels at that speed for 56 feet, until it arrives at the batter. How many seconds, correct to the nearest thousandth of a second, does the batter have from the moment the ball is thrown, until it arrives. Click here to see answer by drj(1380)
 Question 213467: A pitcher can throw a baseball 95 miles per hour. The ball travels at that speed for 56 feet, until it arrives at the batter. How many seconds, correct to the nearest thousandth of a second, does the batter have from the moment the ball is thrown, until it arrives. Click here to see answer by MathTherapy(1483)

 Question 213762: Suppose gold is selling at \$375/ounce. How many milligrams of gold could you buy for one cent? Click here to see answer by Alan3354(31532)

 Question 214526: A block of platinum is 21.45g/cm^3. Calculate its density in kilograms per cubic meter. Click here to see answer by stanbon(57967)

 Question 214603: Element QX has 3 naturally occurring isotopes. QX-18 occurs 72.03% of the time, Qx-17 occurs 22.94% of the time and Q-16 occurs 5.03% of the time. What is the average atomic mass number that would be reported on the periodic table? thank you Click here to see answer by edjones(7569)

 Question 214661: Professor Sum has a total of 56 students. One-half of his students study languages ... 28 students study languages (of the 28, seven of them study French), and One-seventh study Physics, so 8 students study Physics. Click here to see answer by stanbon(57967)

 Question 214746: Galina spent \$3.60 for stamps to mail packages. Some were 30¢ stamps and the rest were 20¢ stamps. The number of 20¢ stamps was 2 less than the number of 30¢ stamps. How many stamps of each kind did Galina buy? Click here to see answer by drj(1380)
 Question 214746: Galina spent \$3.60 for stamps to mail packages. Some were 30¢ stamps and the rest were 20¢ stamps. The number of 20¢ stamps was 2 less than the number of 30¢ stamps. How many stamps of each kind did Galina buy? Click here to see answer by stanbon(57967)

 Question 214034: Is the converse of a true conditional statement always true? Explain. Click here to see answer by RAY100(1637)

 Question 214932: I need your help with this digit problem: The sum of the digits of a two-digit number is 12. The value of the number is two more than 11 times tens digit. Find the number. Click here to see answer by Theo(3504)

 Question 214903: It's about physics. Can you please help me solve it? Please. Four identical masses of 2.0 kg each are situated at the four corners of a square. A side of the square measures 3.0 m. Find the moment of inertia about an axis passing through the center of the square and perpendicular to its plane. Thank you in advance.. Click here to see answer by Earlsdon(6294)

 Question 215040: if < 1 = 56, find < 3 Click here to see answer by drj(1380)

 Question 215607: calculate the molarity of a solution countaining 58.5mg of NaCl in 2.50mL of solution Click here to see answer by morson(1)

 Question 215621: I need help finding the vertex of the parabola... I'm just not sure how to break this equation down 3x^2+30x+71 Click here to see answer by Alan3354(31532)

 Question 215913: Please answer part 1 and 2. Write each of the following equations in the indicated form. Hint: log[b](N)=P <-> B^P=N Part 1: Write 169=13^2 in logarithmic form. Part 11: Write log[1/4](1/64)=3 in exponential form. Click here to see answer by rapaljer(4667)

 Question 216092: wat is the verbal statement of seven is equal to 4 times a number Click here to see answer by checkley77(12569)

 Question 216313: if a number is added to twice its square, the result is 6. find the number. Click here to see answer by Earlsdon(6294)

 Question 216520: a 13-foot ladder is leaning against a house. the distance from the bottom of the ladder to the house is 7 feet less than the distance from the top of the ladder to the ground. how far is the bottom of the ladder from the house? Click here to see answer by drj(1380)

 Question 217101: Assume the shape of an adult cow is a perfectly scaled up version of a younger cow, i.e. assume perfect geometric similarity. If the adult cow weighs 600 kg and has a surface area of 6 square meters while the young cow weighs 100 kg, find the surface area of the young cow. Click here to see answer by rfer(12730)

 Question 217256: If , find Me and my friend are so stuck on this problem. We have no clue how to solve it. We switched the x values and y values but got stuck on: Could you please help us out! Thanks in advance. =) Click here to see answer by jsmallt9(3296)

 Question 217395: what is the positive or negative percentage change in the area of rectangle when the base is increased by 10% and the height increased by 20%? Click here to see answer by Alan3354(31532)

 Question 217649: Use the fact that the earth is is 3960 miles and 1 mile is 5280 feet answer the following question. A tower of a submarine is approximately 15 feet above sea level. How far can a person see from the top of the tower? Click here to see answer by RAY100(1637)

 Question 217830: your friends house is 2 miles away from yours. You bike for 1/2 hour from you friends house in the opposite direction and end up 6 miles from home. about how long will it take to get home if you take the same route Click here to see answer by rfer(12730)

 Question 188078: Five equal squares are joined together to form a rectangle whose perimeter is 372cm. What is the area of one square? Thanks.. Click here to see answer by ankor@dixie-net.com(15746)

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