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 Test Calculators and Practice Answers archive Word Problems Lessons In Depth

 Question 243046: 2 trains, A and B travelling at a constant speeds left 2 different stations 640km apart. Train A started at noon and train B at 1pm. Travelling on parallel tracks towards each other, they passed each other at 4pm. If train A travelled at a speed of x km/h and train B was 20km/h slower than train A, (i) write an expression, in terms of x, for the speed of Train B (ii)write an expression, in terms of x, for the distance covered by train A just before it passed train B Click here to see answer by oberobic(2304)

 Question 243303: The function y=x^4+bx^2+8x+1 has a horizontal tangent and a point of inflection for the same value of x. What must be the value of b? (A) -6 (B) -1 (C) 1 (D) 4 (E) 6 Click here to see answer by Alan3354(30993)

 Question 243300: At what value(s) of x does f(x)= x^4-8x^2 have a relative minimum? (A) 0 and -2 only (B) 0 and 2 only (C) 0 only (D) -2 and 2 only (E) -2,0, and 2 Click here to see answer by Edwin McCravy(8909)

 Question 243249: Estimating the age of a fossil- a fossilized leaf contains 70% of its normal amount of carbon 14. a) how old is the fossil b) using a graphing utility, graph the relation between the percentage of carbon 14 remaining and time. c) using intersect, determine the time that elapses until half the carbon 14 remains d) verify the answer found in part (a) I know this problem seem long but i just want to say thanks for your help. I really appreciate it. Click here to see answer by ankor@dixie-net.com(15652)

 Question 243368: I'm not sure that I'm asking this in the right section, but I'm not really sure where I would need to ask it anyways. The answer is: 3p/2 The problem is this: ((2p-2)/p) * ((6p^2)/(8p*8)) I'm not sure how to get to that answer and I think I don't have a clue on how to even start this one. I started by put the 2 sides together (2p-2)6p^2 ---------- p(8p*8) 3(x-1) Click here to see answer by Alan3354(30993)
 Question 243368: I'm not sure that I'm asking this in the right section, but I'm not really sure where I would need to ask it anyways. The answer is: 3p/2 The problem is this: ((2p-2)/p) * ((6p^2)/(8p*8)) I'm not sure how to get to that answer and I think I don't have a clue on how to even start this one. I started by put the 2 sides together (2p-2)6p^2 ---------- p(8p*8) 3(x-1) Click here to see answer by Gattsbr(1)

 Question 243296: hello 1.ABDC is a timber frame for a concrete base. It is shown to be parallelogram in shape: with AB=CD=10.000m; AC=BD=7.500m. It should be a rectangle. How far, in the x direction, does corner A (or corner B) of the frame have to be moved to create a rectangle shape. Calculate to a precision of 1 mm. Click here to see answer by Edwin McCravy(8909)

 Question 232788: How do you graph the line passing through the given point with the given slope. (0,1) m=2 Click here to see answer by Alan3354(30993)

 Question 243803: the owner of a move theater was counting the money from 1 days ticket sales. He knew that a total of 150 tickets were sold. Adult tickets cost \$7.50 each and childrens tickets cost \$4.75 each. If the totalt receipts for the day were \$891.25, how many of each kind of ticket were sold? Click here to see answer by nyc_function(2733)

 Question 244127: Im having a hard time solving this question. Find the sum of one-eighth,three-fourths,and one-sixth.Express the sum as a fraction Click here to see answer by JimboP1977(308)

 Question 244650: 2x+2<+3x+1 - how would i solve this to graph the line? Click here to see answer by JimboP1977(308)

 Question 244681: two positive numbers are in the ratio of 5:12. if there product is 960 what is the positive diffrence between the two numbers Click here to see answer by edjones(7569)

 Question 244892: Find the equation of the linear function through A & B. A: X = 2, Y = 14 B: X = 5, Y = 8 Click here to see answer by Fombitz(13828)

 Question 244910: A man is 65 years old and his grandson is 20. How many years ago was the grandfather six times as old as the grandson? Click here to see answer by scott8148(6628)

 Question 245703: You are hired by a large company. Your contrack is for 40 years with the starting salary of \$30,000. Your salary increaes 5% every year. Find a formual for your salary in the n-th year? Click here to see answer by rfer(12657)

 Question 246366: If two distinct lines intersect, describe their intersection. Click here to see answer by oberobic(2304)

 Question 246686: In physics class, Taras discovers that the behavior of electrical power, x, in a particular circuit can be represented by the function f(x)=x^2+2x+7/ If f(x)=0, solve the equation and express your answer in simplest a + bi form. please help me solve this problem Please show work thank you Click here to see answer by Alan3354(30993)

 Question 247067: a mountain with a base 8,897 feet below sea level rises 16,493 feet. what is the elevation above sea level of its peak? Click here to see answer by edjones(7569)

 Question 247375: Find the slope,if it exists, of the line containing the pair of points, (-10,-6) and (-16,-18) Click here to see answer by checkley77(12569)
 Question 247375: Find the slope,if it exists, of the line containing the pair of points, (-10,-6) and (-16,-18) Click here to see answer by dabanfield(803)

 Question 247399: I am having a hard time this. Find the slope and the Y intercept of the line. Write the fractional answer in the lowest possible terms. y= -5/7x -7/3 The slope is ? Type an integer or fraction The y intercept is (0,?) Type an integer or fractions. Click here to see answer by stanbon(57347)
 Question 247399: I am having a hard time this. Find the slope and the Y intercept of the line. Write the fractional answer in the lowest possible terms. y= -5/7x -7/3 The slope is ? Type an integer or fraction The y intercept is (0,?) Type an integer or fractions. Click here to see answer by oberobic(2304)

 Question 247893: A rectangular painting with a width of x centimeters has an area of x^2 + 50x square centimeters. Find a binomial that represents the length. Click here to see answer by ankor@dixie-net.com(15652)

 Question 248121: Walt made an extra \$5000 last year from a part-time job. He invested part of the money at 6% and the rest at 10%. He made a total of \$420 in interest. How much was invested at 10%? Click here to see answer by tutorcecilia(2152)

 Question 248194: Pls. help me The longer side of a rectangle is 4 less than twice the shorter side. The perimeter of the rectangle is 40. Find the length of each side of the rectangle. Click here to see answer by richwmiller(9135)

 Question 248691: at the same time of day, a man who is 72 inches tall casts a 54-inch shadow and his son casts a 36-inch shadow. use similar triangles to determine the height of the man's son state the postulate or theorem that can be used to prove the triangles are similar and then justify your answer. Click here to see answer by richwmiller(9135)

 Question 248049: With a 5% sales tax added on, you pay \$21.50. What is the cost of the food before tax? Click here to see answer by richwmiller(9135)

 Question 248902: How many three-digit numbers are divisible by 13? (A) 7 (B) 67 (C) 69 (D) 76 (E) 77 Click here to see answer by chosenpoint(26)

 Question 249096: solve for p: 8p + 3w = w -15 -2p Click here to see answer by actuary(112)

 Question 249674: If the diameter of a cylindrical can is increased by 30 percent, by approximating what percentage should the height be increased to triple the volume of the can ? Click here to see answer by stanbon(57347)

 Question 250231: Find a rational number between 1/8 and 2/4 . Click here to see answer by College Student(505)

 Question 250405: 35. A car travels 55 miles per hour and a plane travels 15 miles per minute. How far does the car travel when the plane travels 500 miles? Click here to see answer by rfer(12657)

 Question 250411: 43. Round each of the following numbers as specified. (a) 245.567 to the nearest hundredth ____245.57__________ (b) 245.567 to the nearest unit ______________ (c) 245.567 to the nearest hundred __200____________ Click here to see answer by Alan3354(30993)