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Graphs/305650: Ok guys Im stuck again and need your help on this damn Cognitive Tudor program, the help and hints on it suck! Cant wait until I finish this class!
I need help to...Graph the equation x-3.1y=8.8 and 9x-9y=-37....I need to find their intersection again on the graph....Please someone help me again! Thanks!
1 solutions
Answer 218827 by richwmiller(9135)   on 2010-05-17 20:25:15 (Show Source):
You can put this solution on YOUR website!This involves a lot of grunt work.
x-3.1y=8.8 and 9x-9y=-37
x=8.8+3.1y
9x-9y=-37
Plug that in for x and have fun.
x=-10.2593, y=-6.14815
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Money_Word_Problems/305631: I have a word problem I can not figure out how to set up. Hope you might be able to help.
Lisa invested in corn. She lost 5% of her investment, costing her $110. What was her initial investment?
1 solutions
Answer 218822 by richwmiller(9135) on 2010-05-17 20:00:29 (Show Source):
You can put this solution on YOUR website!Let's call her investment x.
5% of x is $110
.05*x=110
5x/100=110
x/20=110
x=20*110
I will leave the final multiplication for you.
Why should I have all the fun?
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Divisibility_and_Prime_Numbers/305634: What is the reasoning behind the division of fractions? For example, what does it mean to divide 1/2 by 2/3? Note: I'm not looking for the algorithm or the rule for generating the correct answer but rather the explanation of what it means.
1 solutions
Answer 218814 by richwmiller(9135) on 2010-05-17 19:40:53 (Show Source):
You can put this solution on YOUR website!Well let's take a slightly different problem that can be easily expressed in decimal format.
1/2 divided by 3/4
.50/.75
multiply by 100
50/75
factor out 25
2/3
What just happened.
We want to know how many times 3/4 can go into 1/2
Well it can't go a complete time because 3/4 is larger than 1/2
the ratio holds true for 50/75
How many times can 75 go into 50 it can't one whole time. It can go 2/3 of 1 time?
But what is interesting to me about this problem and yours is how we resolve the problem using fractions.
(1/2)/(2/3)=1/2*3/2=/3/4
and
(1/2) /(3/4) = 1/2*4/3=4/6=2/3 as we learned before.
We used the reciprocals to multiply rather than divide.
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Rate-of-work-word-problems/305608: Frank can cut his lawn in 4 1/2 hours, his wife can cut the same lawn in 4 hours, while their son tom can cut the lawn in 3 1/2 hours. how long would it take to cut the lawn if all three worked together?
1 solutions
Answer 218812 by richwmiller(9135) on 2010-05-17 19:31:50 (Show Source):
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Polynomials-and-rational-expressions/305461: Please help me solve this word problem. I am very confused and it is a new topic. If you could not only give me an answer, but also include steps it would be greatly appreciated.
Boat x sails due south from a pier. Boat Y sails due west from the same pier at the same time. Both sail at a constant speed. Boat x is sailing 2 miles per hour faster than Boat y. After one hour they are 8 miles apart. What is the speed of boat x in miles per hour?
1 solutions
Answer 218701 by richwmiller(9135) on 2010-05-17 14:48:17 (Show Source):
You can put this solution on YOUR website!Word problems are meant to confuse you.
Who in their right mind could imagine that a math student would be able to read and do math?
If one boat goes south and another boat goes west, how could you figure out the distance between them?
look at a map. or draw n on the top of your paper. s on the bottom w on the left side and e on the right side
start in the middle. draw a line going west
go back the starting point in the middle. draw a line going south.
now connect the two end points. label that part 8
What did you draw ? a circle, rectangle or triangle?
What is special about it?
look at the angle in the middle.
What is the formula for distance?
rate (speed) times time =distance
r*t=d
time we are told is one hour
t=1
boat x is going x mph for one hour
boat y is going y mph for 1 hour
x=y+2
distance =1*(y+2)
distance =1*y
y^2+(y+2)^2=8^2
why?
y is the speed of boat y
y+2 is the speed of boat x
You will solve the equation for y but the question asks for x so add 2 to y to get x
Have fun.
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Graphs/305455: I am trying to graph the equation -6x+10y=-60 and 7x-6y=-42 on the cognitive tudor I can not find the correct intersections for x and y to complete the problem can you help me please!
1 solutions
Answer 218681 by richwmiller(9135) on 2010-05-17 14:14:54 (Show Source):
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Probability-and-statistics/305429: 3. You are visiting Dad’s Root Beer Plant in Oakland. You are asked by the plant supervisor to determine if the Dad’s Brand soda machines are correctly dispensing 32 ounces of root beer. In the past, the equipment was assumed to be not working properly if the cans were over-filled or under-filled. You observe the machine filling 9 bottles and collected the data. You are 95% sure that the machine is filling the bottles correctly. The amount dispersed is assumed to be normally distributed: (T-test)
32.12 32.04 32.04
32.13 32.05 32.05
32.22 31.89 32.20
1 solutions
Answer 218680 by richwmiller(9135) on 2010-05-17 14:13:36 (Show Source):
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Permutations/305211: A restaurant offers the following choices for breakfast:
Eggs: scrambled, fried, or poached
Meat: bacon, sausage, or ham
Toast: wheat, white, rye, or pumpernickel
1 solutions
Answer 218544 by richwmiller(9135) on 2010-05-16 20:47:18 (Show Source):
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Permutations/305213: A restaurant offers the following choices for breakfast:
Eggs: scrambled, fried, or poached
Meat: bacon, sausage, or ham
Toast: wheat, white, rye, or pumpernickel
1 solutions
Answer 218543 by richwmiller(9135) on 2010-05-16 20:46:11 (Show Source):
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Graphs/305182: 3 quarts of water are needed to water 1 square foot of lawn. How many gallons of water will be need to water a lawn that measures 30 feets by 60 feet?
1 solutions
Answer 218512 by richwmiller(9135) on 2010-05-16 20:04:06 (Show Source):
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