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

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 Word Problems: Evaluation, Substitution Solvers Lessons Answers archive Quiz In Depth

 Question 470152: if 3a-c=5b and 3a+3b-c=40, what is teh value of b? Click here to see answer by Tatiana_Stebko(1326)

 Question 470248: if x = 2, y = 3 and z = -1, find value of x divided by y Click here to see answer by MathLover1(6638)

 Question 470288: How do I check my answer for this problem? How do I check for for extraneous solutions. What is extraneous solution? How does it happen? sqrt(x+3)=x+1 Click here to see answer by Theo(3464)
 Question 470288: How do I check my answer for this problem? How do I check for for extraneous solutions. What is extraneous solution? How does it happen? sqrt(x+3)=x+1 Click here to see answer by ewatrrr(10682)

 Question 470458: simplify √4(x-√9) and simplify √45(x-√27) Can you please show the steps so that I can figure out what I am doing Click here to see answer by stanbon(57387)

 Question 470580: Please help I don't understand Solve the problem. Be sure to show all of your work. The area of a circle with radius r is given by the formula A = πr2 Find the area of a circle with radius 7 centimeters. Use 3.14 for π. Click here to see answer by ccs2011(207)

 Question 471143: The pitch of a roof is the ratio of the rise to the half-span. If a roof has a rise of 6 feet and a span of 30 feet, what is the pitch? Click here to see answer by bucky(2189)

 Question 471101: Please, please help! i am stuck on my statistics homework and could use the help to see and know how this is done for future assignments. here is the assignment: Resource: Statistics for Psychology Prepare a written response to the following assignments located in the text: • Ch. 1, Practice Problems: 12, 15, 19, 20, 21, and 22. Note. Methods of computation may include the usage of Excel, SPSS™, Lotus®, SAS®, Minitab®, or by-hand computation. here is one of the questions: 15. Following are the speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon: 30, 36, 42, 36, 30, 52, 36, 34, 36, 33, 30, 32, 35, 32, 37, 34, 36, 31, 35, 20, 24, 46, 23, 31, 32, 45, 34, 37, 28, 40, 34, 38, 40, 52, 31, 33, 15, 27, 36, 40 Make (a) a frequency table and (b) a histogram. Then (c) describe the general shape of the distribution. thank you so much in advance! bridget Click here to see answer by Edwin McCravy(8909)

 Question 471307: what is the total number of points of intersection of teh graphs of teh equations x^2+y^2=9 and y=x? Click here to see answer by Alan3354(30993)

 Question 471385: Q)Ram got an order from a garment manufacturer for 480 Denim Shirts. He bought 12 sewing machines and appointed some tailors to do the job. However, many didn't report for duty. As a result,each had to stitch 32 more shirts than originally planned by Ram , with equal distribution of work.How many tailors had been appointed earlier and how many had not reported for work? (a)12,4 (b)10,3 (c)10,4 (d) none of these Click here to see answer by jorel1380(2518)

 Question 471386: Q)it is desired to extract the maximum power of 3 from 24! where n!= n.(n-1). (n-2)....321. What will be the exponent of 3? (a)8 (b) 9 (c)11 (d) 10 Click here to see answer by Alan3354(30993)
 Question 471386: Q)it is desired to extract the maximum power of 3 from 24! where n!= n.(n-1). (n-2)....321. What will be the exponent of 3? (a)8 (b) 9 (c)11 (d) 10 Click here to see answer by richard1234(5390)

 Question 471571: Let Z be a random variable with a standard normal distribution. Find the indicated probability. P(z < 2.75)= Click here to see answer by ewatrrr(10682)

 Question 471309: f(x)= x^2, g(x)= 3x + 1 find (f º g)(2) (gº f)(2) Click here to see answer by robertb(4012)

 Question 471913: Could anyone help on this question i asked some time back but still i haven't got no answers The position vectors of points A and B with respect to the origin O are given by OA = i +3j +3k OB = -4i + 5j +3k Show that cos(AOB) = (4/root38)........i managed this bit Hence or otherwise find the position vector of the point P on OB such that AP is perpendicular to OB By putting 10^x = m show that the solution to the equation (10^x + 10^-x)/(10^x - 10^-x) = k is x = 1/2log[(k + 1)/(k-1)] Hence show that x = log2 + 1/2log3 - 1/2 when k = 11 Click here to see answer by richard1234(5390)

 Question 472089: Hello I have a hard time when it come to math word problem , Why Because I don't be understanding how they want you solve the math problem. I've been stuck on 3 math word problem that I cant seem to figure out . Someone please help me . Problem # 1) Selena left a \$12.76 tip for a meal that cost \$58. a) What percent of the cost of the meal was the tip? b) What was the total cost of the meal including the tip? Problem # 2) Fine Line Trucks rents an 18-ft truck for \$42 plus 35¢ per mile. Judy needs a truck for one day to deliver a shipment of plants. How far can she drive and stay within a budget of \$70? Problem # 3) On an average weekday a full-time college student spends a total of 7.1 hr in educational activities and in leisure activities. The average student spends 0.7 hr more in leisure activities than in educational activities. On an average weekday how many hours does a full-time college student spend on educational activities? Click here to see answer by jorel1380(2518)

 Question 472140: if (px+q)^2=9x^2+kx+16, what is the value of k? Click here to see answer by jorel1380(2518)

 Question 472146: if (3y-1)(2y+k)=ay^2+by=5 for all values of y, what is the value of a+b? Click here to see answer by jorel1380(2518)

 Question 471395: the perimeter of a rectangle with length, l and width, w is given by P = 2w +21 if the perimeter of the rectangle is 105 feet and the length is 35 feet, what is the width? show all work Click here to see answer by bucky(2189)

 Question 472409: The Art of Problem Solving has begun selling a cookbook called \What would Euler eat?" If the price of the cookbook is n dollars (n < 72), then it will sell 720 - 10n copies. What price will maximize the total revenue we receive for the books? Click here to see answer by richard1234(5390)

 Question 472420: Find slope of line that passes through the points (2, -5) and (3,4) Click here to see answer by ewatrrr(10682)

 Question 472423: ( -1) - (7 - 2 x ( -1)) Click here to see answer by jorel1380(2518)

 Question 472427: Evaluate the variable expression when a = - 2, b = 3, and c = 4. 2( b + c ) - 3a Click here to see answer by MathLover1(6638)

 Question 472426: Write the equation of the line on the plane that has an y-intercept of 2 Click here to see answer by solver91311(16897)

 Question 472438: Find the distance between the following points. (1, 3) and (4, 7) Click here to see answer by ewatrrr(10682)

 Question 472680: if the pitch of a roof is 1/4, how many feet in the horizontal direction correspond to a rise in 3 feet? now i know the answer is 12 and i tried plugging the numbers into slope intercept form and got negative 12 but didnt know eactly if that was the right way to do it or not....please help!!!! thank you Click here to see answer by algebrahouse.com(1079)

 Question 472863: Is the line through points P(1, 9) and Q(9, 6) perpendicular to the line through points R(-6, 0) and S(-9, 8)? Explain. a. Yes; their slopes have product -1 b. No; their slopes are not opposite reciprocals. c. No; their slopes are not equal d. Yes; their slopes are equal Click here to see answer by ewatrrr(10682)
 Question 472863: Is the line through points P(1, 9) and Q(9, 6) perpendicular to the line through points R(-6, 0) and S(-9, 8)? Explain. a. Yes; their slopes have product -1 b. No; their slopes are not opposite reciprocals. c. No; their slopes are not equal d. Yes; their slopes are equal Click here to see answer by Alan3354(30993)

 Question 472869: Write the sum of the two vectors as an ordered pair. (5, -2) and (0, 0) Click here to see answer by stanbon(57387)

 Question 472865: A glider lands 17 miles west and 9 miles south from where it took off. The result of the trip can be described by the vector (-17, -9). Use distance (for magnitude) and direction to describe this vector a second way. a. about 19 miles at 28 degrees south of west b. about 28 miles at 19 degrees north of west c. about 19 miles at 28 degrees north of west d. about 28 miles at 19 degrees south of west Click here to see answer by stanbon(57387)

 Question 472864: An airplane aver the Pacific sights an atoll at an angle of depression of 5 degrees. At this time, the horizontal distance from the airplane to the atoll is 4629 meters. What is the height of the plane to the nearest meter? Click here to see answer by Alan3354(30993)

 Question 473264: The second angle of a triangle measure 10 more than the first angle. The third angle measures 30 less than twice the second angle. what are the measure of the 3 angles Click here to see answer by stanbon(57387)