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 Test Calculators and Practice Answers archive Word Problems Lessons In Depth

 Question 326852: ellen and Kate raced on their bikes to the library after school. they both left school at 3:00 pm and bicycled along the same path. Ellen rode at a speed of 12 mph while Kate rode at a speed of 9 mph. Ellen got to tv library 15 minutes before kate. a) how long did it take Ellen to get to the library? b) at what time did Ellen get to the library? Click here to see answer by galactus(183)

 Question 326871: How much time is required to lift a 525 kg object 25.0 m with a motor that produces 2.50 kW? Round your answer to the nearest tenth of time unit. Click here to see answer by Fombitz(13828)

 Question 326873: 7. A farmer lifts a dozen 100-lb sacks of grain from the ground to the bed of his truck 3.50 ft above the ground. What is the total work done by the farmer on the grain? Express your answer in US units to the nearest unit in the following manner: number (1 space) unit (1 space) unit Click here to see answer by Fombitz(13828)

 Question 326872: A 2 lb rock is dropped from a bridge to the water that is 50 ft below. What is its kinetic energy at the moment it hits the water? Submit your answer in US units to the nearest tenth of a unit. Click here to see answer by Fombitz(13828)

 Question 326883: How much time is required to lift a 525 kg object 25.0 m with a motor that produces 2.50 kW? Put answer to the nearest tenth of a time unit. Click here to see answer by Fombitz(13828)

 Question 326914: Use the compound interest formulas A=P((1)+(r/n))^(nt) and A=Pe^(rt) to solve. Suppose that you have \$10000 to invest. which investment yields the greater return over 4 years: 8.75% compounded continuously or 8.9% compounded semiannually? a. Both investments yield the same return. b. \$10000 invested at 8.9% compounded semiannually over 4 years yields the greater return. c. \$10000 invested at 8.75% compounded continuously over 4 years yields the greater return. Click here to see answer by solver91311(16885)

 Question 327008: I am trying to solve this story problem and I am not getting the right answer no matter what I do. Just need some help. Soybean meal is 18% protein and cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360-lb mixture that is 13% protein? Thanks :o) Click here to see answer by rfer(12657)

 Question 327005: I am trying to solve this problem by using the elimination method. 0.05x + 0.025y = 11 0.15x + 0.05y = 12 Thanks :o) Click here to see answer by AAfter Search(61)

 Question 327007: Trying to figure out this story problem and I am having some difficulty. A disc jockey must play 16 commercial spots during 1 hour of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during 1 hour is 13 mins. How many 30-second commercials were played that hour? And how many 60-second commercials? Thanks :o) Click here to see answer by mananth(12270)

 Question 327003: I am trying to solve by the elimination method. 0.3x-0.2y=4 0.2x+0.5y=-3 Click here to see answer by jvan(28)

 Question 327004: Trying to solve by using the elimination method 4x-9y=10.5 7y-2x=-6.5 Click here to see answer by Fombitz(13828)

 Question 326910: The function A=Asubzero(e)^(-0.01386x)models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 400 pounds of the material are initially put into the vault, how many pounds will be left after 120 years? a. 480 lbs. b. 83 lbs. c. 300 lbs. d. 76 lbs. Click here to see answer by Fombitz(13828)

 Question 327561: What is the average arithmetic mean of 8,7,7,5,3,2,and 2 Click here to see answer by Alan3354(30993)

 Question 327778: A woman changes a flat tire with a tire iron 50.0 cm long. She exerts a force of 53.0 N. How much torque does she produce? Express your answer in metric units to the nearest tenth of a unit. Click here to see answer by galactus(183)

 Question 327773: A motorcycle wheel turns (100 * pi) radians during a 45.0 second period. What is the angular velocity of the wheel? Express your answer in metric units to the nearest hundredth of a unit. Click here to see answer by galactus(183)

 Question 327849: How much time is required to lift a 525 kg object 25.0 m with a motor that produces 2.50 kW? Click here to see answer by scott8148(6628)

 Question 327896: what is the percent of college students who study between 20 and 36 hours per week Click here to see answer by Alan3354(30993)

 Question 327846: A torque of 81.0 ft lb is produced by a torque arm of 3.00 ft. What force is applied? Express your answer in English unit to the nearest unit. Click here to see answer by Fombitz(13828)

 Question 327962: determine whether (-6,-8) is a solution of 5x-5y=6 Click here to see answer by AAfter.Com(18)

 Question 328121: Find the x-intercept of the line whose equation is 10x plus 3y equal 1 Click here to see answer by solver91311(16885)

 Question 328130: I wanted to know what fractional part of an hour is 2 minutes not 18 minutes? Click here to see answer by Alan3354(30993)

 Question 328168: solve the equation 7x^2+8x=0 smaller value larger value Click here to see answer by Fombitz(13828)

 Question 328139: 1/13 divided by 3 3/4, Write the results in simplest form. Click here to see answer by nyc_function(2733)

 Question 328181: There are 112 male and 78 females working at a hospital. What percentage of the hospitals workforce is female? Click here to see answer by JBarnum(2044)
 Question 328181: There are 112 male and 78 females working at a hospital. What percentage of the hospitals workforce is female? Click here to see answer by nyc_function(2733)

 Question 328179: What is 5x-4[x-4]=6+3x how did u get to 5x-4x+16=6+3x Click here to see answer by Edwin McCravy(8909)
 Question 328179: What is 5x-4[x-4]=6+3x how did u get to 5x-4x+16=6+3x Click here to see answer by JBarnum(2044)

 Question 328331: decide whether the pairof lines is parallel,perpendicular, or neither 5x+2y=4 2x-5y=5 Click here to see answer by mananth(12270)

 Question 328329: solve for the indicated letter d=4h, for h Click here to see answer by mananth(12270)