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 Test Calculators and Practice Answers archive Word Problems Lessons In Depth

 Question 260961: The unit digit of a two-digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10. Click here to see answer by drk(1908)

 Question 260964: The difference etween the length and width of a rectangle is 7 centimeters. Find the dimensions of the rectangle if its perimeter is 50 centimeters. Click here to see answer by Greenfinch(383)

 Question 261032: A student wants to know how many integers between 1 and 1000 are a multiple of 4 or a multiple of 5. She wonders if it is correct to find the number of those integers that are multiples of 4 and add the number of those that are multiples of 5. How do you respond? Click here to see answer by Greenfinch(383)

 Question 261031: Using logarithms, find the real root of the equation to the nearest tenth. Click here to see answer by Greenfinch(383)

 Question 260969: Last year, Jodi invested \$10,000, part at 6% annual interest and the rest at 8% annual interest. If she received \$760 in interest at the end of the year, how much did she invest at each rate? Click here to see answer by checkley77(12569)

 Question 261065: A quart of vodka is 30% alcohol. Write a formula for the percentage of alcohol in a mixture of V quarts of vodka and J quarts of orange juice. Click here to see answer by Edwin McCravy(8908)

 Question 261073: This year John's mother is exactly three times as old as he is. Last year, their ages added up to 50. How old is John? 5x3 = 45, John's mother must be 45 and John is 5 5+45 = 50 is that correct? Click here to see answer by mananth(12270)

 Question 261342: In a bottling plant we need to test the pressure in abottle and the same have to filled in certian parmeter , they got two test,samling is done on 30 bottle after doing testin on first , the qulaity manager said the the test was not correct so he did the seocnd test on second machine ........... means on 30 first machine smaple is 181.5 and 181.7 how we will be testing hypothiese ? it is derised that mean pressure strength is 175psi from the previous exeprience the stand deviation is more or less stable at 10. Click here to see answer by stanbon(57337)

 Question 261309: The larger of two positive integers is five more than twice the smaller integer. The product of the integers is 52. What are the two integers? Click here to see answer by Greenfinch(383)

 Question 261421: d/dx ln(1/x^2-1)= (A) 1/x^2-1 (B) -2x/x^2-1 (C) 2x/x^2-1 (D) 2x^3-2x (E) 2x-2x^3 Click here to see answer by jim_thompson5910(28595)

 Question 261444: In a certain community, 3% of he population has personal income under 20,000 per year and 69% has personal income over \$50,000 per year. Find the percentage of the population with income between \$20,000 and \$50,000. Click here to see answer by palanisamy(496)

 Question 261485: The equation of the line tangent to the curve y=kx+8/k+x at x=-2 is y=x+4. What is the value of k? (A) -3 (B) -1 (C) 1 (D) 3 (E) 4 Click here to see answer by richwmiller(9135)
 Question 261485: The equation of the line tangent to the curve y=kx+8/k+x at x=-2 is y=x+4. What is the value of k? (A) -3 (B) -1 (C) 1 (D) 3 (E) 4 Click here to see answer by jim_thompson5910(28595)

 Question 261640: If y=5^(x^3-2), then dy/dx= (A) (x^3-2)5^(x^3-2) (B) 3x^2(ln5)5^(x^3-2) (C) (3x^2)5^(x^3-2) (D) (ln5)5^(x^3-2) (E) x^3(ln5)5^(x^3-2) Click here to see answer by jim_thompson5910(28595)

 Question 261766: The equation of the tangent line to the curve y=x^3-6x^2 at its point of inflection is (A) y= -12x+8 (B) y= -12x+40 (C) y= 12x-8 (D) y= -12x+12 (E) y= 12x-40 I know that the point of inflection relates to the second derivative, so do I just take the double derivative of the given equation? Click here to see answer by jim_thompson5910(28595)

 Question 261877: Assume that a procedure yields a binomial distribution with a trail repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial. n = 6, x = 3, p =1/6 Click here to see answer by drk(1908)

 Question 261937: What are all the formulas for every area of a figure? (circles, triangles, and squares) Click here to see answer by richwmiller(9135)

 Question 262236: If x^2yx^2=6, then d^2y/dx^2 at the point (1,3) is (A) -18 (B) -6 (C) 6 (D) 12 (E) 18 Click here to see answer by Alan3354(30993)

 Question 262264: If x^2y+yx^2=6, then d^2y/dx^2 at the point (1,3) is (A) -18 (B) -6 (C) 6 (D) 12 (E) 18 Click here to see answer by Fombitz(13828)

 Question 262269: For what values of x is the function f(x)= 5+15x+6x^2-x^3 decreasing? Click here to see answer by drk(1908)

 Question 262293: The derivative of (4x)^3 * (2x)^6 is I know that I have to use the chain rule, but I get lost after that. Click here to see answer by drk(1908)

 Question 262347: I am working in week eight of math 116. I am on problem 13 which the first part is a numberline graph. I was asked to choose the compound inequality, which I was able to do. However the second part of the question askes me to write the solution in interval notation. The problem is x<9 and x>=-6. Does anyone know how to do this problem? If so I really need some help. Thank you in advance Deborah Click here to see answer by solver91311(16884)
 Question 262347: I am working in week eight of math 116. I am on problem 13 which the first part is a numberline graph. I was asked to choose the compound inequality, which I was able to do. However the second part of the question askes me to write the solution in interval notation. The problem is x<9 and x>=-6. Does anyone know how to do this problem? If so I really need some help. Thank you in advance Deborah Click here to see answer by Edwin McCravy(8908)

 Question 262768: Solve: The Palmyra Triangle has a perimeter of 4400 miles. The side of the middle length is 2 times as long as the shortest side. The longest side is 4 times as long as the middle side. How long is each of the three sides? Click here to see answer by drk(1908)

 Question 262835: If y=5^(x^3-2), then dy/dx= (A) (x^3-2)5^(x^3-2) (B) 3x^2(ln5)5^(x^3-2) (C) (3x^2)5^(x^3-2) (D) (ln5)5^(x^3-2) (E) x^3(ln5)5^(x^3-2) Click here to see answer by jim_thompson5910(28595)

 Question 262866: t 1/2 +3t 1/4 +2=0 solve this problem Click here to see answer by pinklipgloss2007(6)
 Question 262866: t 1/2 +3t 1/4 +2=0 solve this problem Click here to see answer by richwmiller(9135)

 Question 262946: The correspondence between women's shoe size in the United States and women's shoe size in Italy is determined by the formula: S= 2(x + 12) where S is the shoe size in Italy and x is the shoe size in the United states. What would be the US shoe size for an Italian size 41? Click here to see answer by rfer(12657)

 Question 263008: The equation of the tangent line to the curve y=x^3-6x^2 at its point of inflection is (A) y=-12x+8 (B) y=-12x+40 (C) y=12x-8 (D) y=-12x+12 (E) y=12x-40 Click here to see answer by Alan3354(30993)

 Question 263007: find the vertex and axis of symmetry and graph the function h(x)=x^2-5x Click here to see answer by josmiceli(9674)

 Question 263130: If the radius of a sphere is increasing at the rate of 2 inches per second, how fast, in cubic inches per second, is the volume increasing when the radius is 10 inches? (A) 40π (B) 80π (C) 800 (D) 800π (E) 3200π Click here to see answer by drk(1908)

 Question 263156: I have another test coming up and i know this is going to be on the test so i was trying to figure out how to do it but for the life of me i cant. so I was wondering if someone could explain to me specifically how to find how many 1/8 are in 3 and 1/2? Click here to see answer by Alan3354(30993)
 Question 263156: I have another test coming up and i know this is going to be on the test so i was trying to figure out how to do it but for the life of me i cant. so I was wondering if someone could explain to me specifically how to find how many 1/8 are in 3 and 1/2? Click here to see answer by stanbon(57337)

 Question 263155: A parabola with equation y=x^2+bx+c passes through the points (2,3) and (4,3). What is c? (A)2 (B)5 (C)7 (D)10 (E)11 (from AMC 10 2006 A). I'm in 7th grade and i need to study for the upcoming AMC 10 2010 Click here to see answer by drk(1908)

 Question 263201: Assume that a procedure yields a binomial distribution with a trial repeated n times .use the binomial probability to find the probability of x successes given the probability p of success on a single trial. n=6,x=3,p=1/6 Click here to see answer by stanbon(57337)

 Question 263226: the body mass index, i , can be used to determine an individual's risk for heart disease an index less than 25 indicates a low risk the body mass index is given by the formula or model I= 700w .jernme is 77 inches tall. what wieghts will keep his body mass index between 22 and 33 Click here to see answer by stanbon(57337)

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