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Recent problems solved by 'josmiceli'

josmiceli answered: 9669 problems
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logarithm/436308: I have a formula that has 20*log(10) in it and I am confused as to what log would be in this formula. Can you please help me with this? 1 solutions Answer 301876 by josmiceli(9671)   on 2011-04-15 16:26:54 (Show Source): You can put this solution on YOUR website! You have to read equations like this carefully. Remember that logs are exponents The left side is saying that the right side is a log which is an exponent, so is a log. The base is assumed to be . So far you have . This is equal to whatever is in the parentheses, or . So you have . So, must be

Evaluation_Word_Problems/436337: a farmer was paid 7500$ for shipment of 2500 chickens. how much should they recieve for a shipment of 4000 chickens? 1 solutions Answer 301873 by josmiceli(9671)   on 2011-04-15 16:17:26 (Show Source): You can put this solution on YOUR website! dollars/chicken (chickens)x(dollars/chicken) They should receive $12,000

Miscellaneous_Word_Problems/436332: Soybean is 18% protein Cornmeal is 9% protein How many lbs of each should be mixed together to get 360-lb mixture that is 12% protein? 1 solutions Answer 301872 by josmiceli(9671)   on 2011-04-15 16:14:15 (Show Source): You can put this solution on YOUR website! Let = pounds of soybean needed Let = pounds of cornmeal needed given: = protein in soybeans = protein in cornmeal (1) (2) ----------------------- (2) (2) (2) (2) Multiply both sides of (1) by and subtract (1) from (2) (2) (1) and (1) 120 pounds of soybeans are needed 240 pounds of cornmeal are needed check answer: (2) (2) (2) OK

percentage/436245: A shopkeeper sold two articles for $ 48 each. He made a 25 % profit on one article and loss of 20 % on the other on cost. What was his net gain or loss on the sale of the two articles? 1 solutions Answer 301826 by josmiceli(9671)   on 2011-04-15 12:18:40 (Show Source): You can put this solution on YOUR website! His profit (or loss) was: His net gain was $2.40

Numbers_Word_Problems/436253: What is the smallest set of three consecutive odd integers whose sum is greater than 21? 1 solutions Answer 301825 by josmiceli(9671)   on 2011-04-15 12:11:28 (Show Source): You can put this solution on YOUR website! The smallest set is ( 7,9,11 )

Exponential-and-logarithmic-functions/436267: solve for x ln(x+1)+2=4 1 solutions Answer 301824 by josmiceli(9671)   on 2011-04-15 12:07:56 (Show Source): You can put this solution on YOUR website! check answer: OK

Exponential-and-logarithmic-functions/436256: m=a (over)1+be^x numerator is A demoninator is 1+be^x solve for x. 1 solutions Answer 301822 by josmiceli(9671)   on 2011-04-15 12:00:50 (Show Source): You can put this solution on YOUR website! Multiply both sides by Take the ln of both sides

Travel_Word_Problems/436052: HELP, PLZ..... A woman commutes to work first by train, then rides a bicycle from the station to her office. The train averages 50 mi/h, and she averages 15 mi/h on her bicycle. The total distance of her commute is 13 miles, and the combined trip takes 24 minutes. How far does she ride the train? 1 solutions Answer 301707 by josmiceli(9671)   on 2011-04-14 22:05:04 (Show Source): You can put this solution on YOUR website! Let = her time spent on the train Let = the distance she travels on the train Equation for train: Equation for bike: By substitution: Now find She rides the train for 10 miles check answer:

Numbers_Word_Problems/436076: The perimeter of a square tent is 82 feet. Find the area of the ground which the tent will cover. 1 solutions Answer 301700 by josmiceli(9671)   on 2011-04-14 21:46:09 (Show Source): You can put this solution on YOUR website! The length of one side of the tent is: ft2

Functions/436064: A reservation clerk worked 12.6 hours one day. She spent twice as much time entering new reservations as she did verifying old ones and one and a half as much time calling to confirm reservations as verifying old ones. How much time did she spend entering new reservations? 1 solutions Answer 301699 by josmiceli(9671)   on 2011-04-14 21:42:48 (Show Source): You can put this solution on YOUR website! The times are in the ratios 2, 1, 1.5 The fractions of 12.6 for each task is: Entering new reservations: Verifying old reservations: Calling to confirm: ------------------ Time spent entering new reservations: hours

Expressions-with-variables/436053: Please help me solver this, I have a really hard time understanding it. My teacher calls it elimination. x-5y=5 + 2x+10y=6. Thank you. 1 solutions Answer 301694 by josmiceli(9671)   on 2011-04-14 21:30:06 (Show Source): You can put this solution on YOUR website! It looks like you have 2 equations. A general rule about equations is: If you want to find the values of the unknowns, the number of equations has to equal the number of unknowns. You have 2 equations and 2 unknowns, so you know you can solve for and . You just have to decide what method to use. Elimination means that you get the equations into a form where you can add or subtract them and eliminate one of the unknowns. (1) (2) The easiest path here is to divide both sides of (2) by (2) Now you can just add (1) and (2) (1) (2) Now put this result back into either (1) or (2) (2) (2) Subtract from both sides (2) --------------- Just plug the answers back into (1) and (2) to check (1) (1) OK

Surface-area/436039: Hi ther, I have no idea what im doing,...can you help please? QUESTION: Phan is painting his bed room,Which is 12ft by 14ft.The walls are 9ft high.On one of the longer walls,there is a a rectangular window that is 9ft by 2ft.One of the shorter walls has a door that is 6.5ft by 3ft.One can of paint covers about . If he puts one coat on each wall,how many cans of paint will phan need? .....as you can see..if i knew what to do,I wouldnt be here -_-. Thanks Tutors! 1 solutions Answer 301688 by josmiceli(9671)   on 2011-04-14 21:13:24 (Show Source): You can put this solution on YOUR website! There are 4 walls to paint. The dimension that is common to all 4 walls is the height, 9 ft. wall #1: ft2 wall #2: ft2 wall #3: ft2 wall #4: ft2 The total area of the walls is: ft2 He will need 2 cans,

Equations/435799: on monday steven killed three more than twice the amount of frogs he killed on tuesday.on monday and tuesday combined he killed nine frogs . how many frogs did he kill monday? 1 solutions Answer 301604 by josmiceli(9671)   on 2011-04-14 13:33:01 (Show Source): You can put this solution on YOUR website! Let = number he killed on Monday Let = number he killed on Tuesday ------------------ By substitution: and He killed 7 frogs on Monday

Miscellaneous_Word_Problems/435785: The cost of 30 onions is d dollars. At this rate, how many onions can you buy for 80 cents? 1 solutions Answer 301580 by josmiceli(9671)   on 2011-04-14 12:24:10 (Show Source): You can put this solution on YOUR website! There are cents in dollars, so the rate for onions is onions/cent onions/cent x cents = onions

Finance/435776: I want to find the IRR by solving for r when the NPV is equal to zero. 24/(1+r)+32/(1+r)^2 -50=0 However I am geting trouble solvong for r. Any help and sugestions will be kindly appreciated 1 solutions Answer 301576 by josmiceli(9671)   on 2011-04-14 12:09:28 (Show Source): You can put this solution on YOUR website! Multiply both sides by Use quadratic equation to solve You can finish and check for math errors.

Travel_Word_Problems/435264: In one hour, Ed drives 25 miles farther in his car than Frank can cycle on his bike. If it takes Frank 1 1/2 hours longer to cycle 75 miles than it take Ed in his car, how fast can Frank cycle? Please help me with this problem, thanks. 1 solutions Answer 301299 by josmiceli(9671)   on 2011-04-13 15:41:18 (Show Source): You can put this solution on YOUR website! The 1st sentence says that Ed's speed is 25 miles/hr faster than Frank's Let = Frank's speed Let = Ed's time to go 75 miles in his car Frank's equation: Ed's equation: ------------------------- This is 2 equations with 2 uhnknowns, so it's solvable Since the distances are equal, Using quadratic formula: Frank's speed is 25 mi/hr check answer: hr OK OK

logarithm/435243: Express as a single logarithm log 8 + 6 log 3 1 solutions Answer 301292 by josmiceli(9671)   on 2011-04-13 14:53:27 (Show Source): You can put this solution on YOUR website! ----------------- You can check with a calculator: OK

Linear_Equations_And_Systems_Word_Problems/435249: You are making 10 tons of concrete that is 36.2% cement by mixing a 17% cement mix- ture with a 65% cement mixture. a) How much of the 65% cement mixture must you use? Answer in units of tons. 1 solutions Answer 301286 by josmiceli(9671)   on 2011-04-13 14:46:54 (Show Source): You can put this solution on YOUR website! Let = tons of 17% mixture needed Let = tons of 65% mixture needed given: (1) tons (2) ------------------------ (2) (2) Multiply both sides of (1) by and subtract (1) from (2) ------------------------ (2) (1) and, since (1) 6 tons of 17% mixture are needed 4 tons of 65% mixture are needed check: (2) (2) OK

Money_Word_Problems/435251: a coffee company wants a new flavor of cajun coffee .how many pounds of coffee worth $9 a pound should be added to 30 pounds of coffee worth $3 a pound to get a mixture worth $7 a pound 1 solutions Answer 301284 by josmiceli(9671)   on 2011-04-13 14:36:16 (Show Source): You can put this solution on YOUR website! Let = pounds of $9/lb coffee to be added = cost of coffee to be added = cost of $3/lb coffee = cost of final mixture ------------------------ 60 pounds of $9/lb coffee must be added be added

logarithm/435247: Please help me solve this equation: Find the exact solution to the equation below 4ln (3x+6)=18 1 solutions Answer 301283 by josmiceli(9671)   on 2011-04-13 14:28:04 (Show Source): You can put this solution on YOUR website!

logarithm/435244: Express as a single logarithm log 11 - log 6 + 1/3log 8 + 1/3log 729 1 solutions Answer 301281 by josmiceli(9671)   on 2011-04-13 14:22:45 (Show Source): You can put this solution on YOUR website!

Problems-with-consecutive-odd-even-integers/434925: find the two consecutive integers such that the square of the smaller is 10 more than the larger 1 solutions Answer 301148 by josmiceli(9671)   on 2011-04-12 20:08:36 (Show Source): You can put this solution on YOUR website! call the consecutive integers and given: I can't make any sense of the problem. Was it copied right?

Functions/434922: Hiiii so i have a problem on functions. i know how to graph regular functions, but when "f" is put in I AM LOST. like an example is f(x) = x2 + x - 12 i rlly am just completely lost. i could use some major help please! thanks!! 1 solutions Answer 301146 by josmiceli(9671)   on 2011-04-12 19:59:26 (Show Source): You can put this solution on YOUR website! Any time you see , you can substitute a letter like or . Also, f(x) doesn't have to be . You can simply say . Now you can use . If I say , then what is the advantage of saying it that way? I have said that f(something) = (something)^3 and now I can say Also, I can add functions of , like

Numbers_Word_Problems/434770: Can someone show me the formula for this equation so I can use it as a basis to help with the rest of my son's homework. four times an even number is 13 more than 3 times the next odd number. What is the even number? 1 solutions Answer 301089 by josmiceli(9671)   on 2011-04-12 16:07:11 (Show Source): You can put this solution on YOUR website! Since the numbers go even,odd,even,odd, etc. you can call the numbers and given: the numbers are 16 and 17 check: OK

Percentage-and-ratio-word-problems/434765: if the midterm is worth 3/5 of my grade and the final is worth 2/5 of my grade. I need a 70% to pass the class and I received an 88 on the midterm what grade do I have to get on the final to pass? 1 solutions Answer 301087 by josmiceli(9671)   on 2011-04-12 16:00:07 (Show Source): You can put this solution on YOUR website! I can say that the grade for the class is a percent of 500 points The grade for the midterm is a percent of 300 points The grade for the final is a percent of 200 points points is a passing grade is the grade for the midterm You need to get points on the final exam to pass the course. This is a grade of You need a 43% on the final to pass the course This seems low. You should get a 2nd opinion on this

logarithm/434760: Express as a single logarithm log 10 + log 2 1 solutions Answer 301078 by josmiceli(9671)   on 2011-04-12 15:37:08 (Show Source): You can put this solution on YOUR website! check: OK

Geometry_Word_Problems/434734: Anita is going to put square tiles on the wall above the bathtub. THe tiles are 2 inches on each side. The section of wall is 64 inches long and 42 inches high. How many tiles will she need? 1 solutions Answer 301076 by josmiceli(9671)   on 2011-04-12 15:33:46 (Show Source): You can put this solution on YOUR website! The area of the section of wall is in2 The area of each tile is in2 She needs 672 tiles

Linear_Equations_And_Systems_Word_Problems/434745: a used CD costs $2 less than 2 used cassettes. Find the cost of a used CD and a used cassette if the total cost for two CDs and six cassettes is $46. 1 solutions Answer 301075 by josmiceli(9671)   on 2011-04-12 15:21:52 (Show Source): You can put this solution on YOUR website! Let = cost of a used CD Let = cost of a used cassette given: (1) (1) (2) Multiply both sides of (1) by and add (1) and (2) (1) (2) And (1) (1) (1) $8 is the cost of a used CD $5 is the cost of a used cassette

Geometry_Word_Problems/434431: A plane flying at 35,000 feet above the ground starts making a descent 150 miles from the airport. What is its angle of descent? 1 solutions Answer 300987 by josmiceli(9671)   on 2011-04-11 20:20:49 (Show Source): You can put this solution on YOUR website! First, the units must be the same mi x ft/mi = ft The angle of descent is the angle whose tangent is degrees

Quadratic_Equations/434435: y2-4y-45=o I need help solving this my teacher went through it in class but i still don't get it please go through it step by step. Thank you :) 1 solutions Answer 300984 by josmiceli(9671)   on 2011-04-11 20:09:20 (Show Source): You can put this solution on YOUR website! It depends on what method your teacher was trying to show you I'll use the method known as "completing the square" Add to both sides Take of the coefficient of , square it, and add it to both sides Each side is now a perfect square Take the square root of both sides (both (+) root and (-) root) (1) and (2) ----------- You can rewrite (1) and (2) as: (1) (2) Now you can factor the equation:

Geometry_Word_Problems/434410: Tim is welding a tank. He can make tank A, which would be 4 feet wide by 5 feet long by 3.5 feet deep. Or he can make tank B, which would be 4 feet wide, 5.5 feet long, and 3 feet deep. What is the difference in the number of cubic feet the tanks hold. Thank you... 1 solutions Answer 300974 by josmiceli(9671)   on 2011-04-11 19:57:41 (Show Source): You can put this solution on YOUR website! Tank A: ft3 Tank B: ft3 Tank A is bigger by ft3