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Graphs/108446: Amelia chose 3 cds that each cost $16. The sales tax on the three cds is $3.96. Write a direct variation equation relating sales tax to the price.
1 solutions
Answer 79091 by checkley71(8403)   on 2007-11-06 21:11:29 (Show Source):
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Trigonometry-basics/108452: Lula wants to round 76.24491 to the nearest hundredth. She first rounds 76.24491 to 76.245 and then rounds 76.245 to 76.25 and claims that this is the final answer. What is wrong with this approach?
a) When rounding you only need to look at the number to the right of the place you are rounding to .. so in this case she should have simply looked at 76.24 .. The number just to the right of the hundredth place is less than 5 so you just discard that and all other digits after it. The Correct answer in this case would be 76.44.
b) When rounding you only need to look at the number to the right of the place you are rounding to .. so in this case she should have simply looked at 76.91 .. The number just to the right of the hundredth place is less than 5 so you just discard that and all other digits after it. The Correct answer in this case would be 78.24.
c) When rounding you only need to look at the number to the right of the place you are rounding to .. so in this case she should have simply looked at 76.24491 .. The number just to the right of the hundredth place is less than 5 so you just discard that and all other digits after it. The Correct answer in this case would be 76.24.
d) none of the above.
Can someone please help me with this one problem? I actually think this is the only question that I cannot grasp.
1 solutions
Answer 79089 by checkley71(8403) on 2007-11-06 21:07:43 (Show Source):
You can put this solution on YOUR website!76.24491 ROUNDING TO THE NEAREST HUNDREDTH WHICH IS THE FIRST 4.
BECAUSE THE NEXT LOWEST DIGIT IS A 4 THUS WE LEAVE THE FIRST 4 ALONE & ZERO OUT ALL DIGITS TO THE RIGHT.
THUS THE ANSWER C) 76.24 IS CORRECT.
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Surface-area/108451: Mitchell is building a 6-foot square wooden deck for his tree house. He will use 3/4 inch thick pine planks that are 8 feet long and six inches wide. His carpenter's plans warn him to not use pieces less than 3 feet long for the deck. How many planks must Mitchell buy to make the tree house deck?
I am in 5th grade and I can't figure this one out. Even my parents have worked on it and they can't figure it out.
1 solutions
Answer 79085 by checkley71(8403) on 2007-11-06 21:01:22 (Show Source):
You can put this solution on YOUR website!6 FEET=6*12=72 INCHES NEED TO BE FILLED WITH 6 INCH PLANKS.
72/6=12 PLANKS BECAUSE HE CAN ONLY GET ONE 6 FOOT PLANK FROM EACH PIECE DUE TO HIS INABILITY TO USE THE 2 FOOT PIECE.
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Trigonometry-basics/108449: Arrange in order from smallest to largest.
2.05, 25/10, 2.0513, 2.059, 251/100, 2.0515, 2.052, 2.051
Can someone please help me. Once again I do not even no where to start. (the 25/20 and 251/100 are fractions.)
1 solutions
Answer 79081 by checkley71(8403) on 2007-11-06 20:54:18 (Show Source):
You can put this solution on YOUR website!2.0500, 2.5000, 2.0513, 2.0590, 2.5100, 2.0515, 2.0520, 2.0510 ALL CONVERTED TO DECIMALS WIUTH THE SAME NUMBER OF DIGITS.
2.0500, 2.0510, 2.0513, 2.0515, 2.0520, 2.0590, 2.5000, 2.5100 ANSWER.
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Expressions-with-variables/108420: im not sure if im doing my problems correctally here is one if them, c/-59=-7
the first set of numbers being a fraction
1 solutions
Answer 79074 by checkley71(8403) on 2007-11-06 20:18:09 (Show Source):
You can put this solution on YOUR website!A SIMPLIER EXAMPLE IS:
1/2=2/4 NOW CROSS MULTIPLY.
NUMERATOR OF THE LEFT FRACTION*THE DENOMINATOR OF THE RIGHT FRACTION (1*4)=THE NUMERATOR OF THE RIGHT FRACTION*THE DENOMINATOR OF THE LEFT FRACTION (2*2).
1*4=2*2
4=4
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C-59=-7/1 NOW CROSS MULTIPLY
1C=-7*-59
1C=413 ANSWER.
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Functions/108440: This question is from textbook algebra 1
I'm not sure how to answer this problem. Can you help me? The problem is y= x+7
x= (-3)
Thamk you if you find the answer? Thank you for trying if you don't.
1 solutions
Answer 79069 by checkley71(8403) on 2007-11-06 20:04:43 (Show Source):
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Number-Line/108439: This question is from textbook SAXON MATH 7/6
The question is: On a number line,the square root of 60 is between which two consequtive numbers?
I got in between 7&8 because 7*7=49 and 8*8=64 and they are in between60.Is that right?
Thank You
1 solutions
Answer 79068 by checkley71(8403) on 2007-11-06 20:02:19 (Show Source):
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Radicals/108432: Hello out there,I need some help with some tough problems,the first one is,Simplify:(S.ROOT)9ab^4.The next one is,Simplify:(S.ROOT)500.The third one is,Simplify:(S.ROOT)9(S.ROOT)4.And the last one is,Simplify:(S.ROOT)56/(S.ROOT)8,Thanks to whoever can help.
1 solutions
Answer 79061 by checkley71(8403) on 2007-11-06 19:51:38 (Show Source):
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Equations/108426:
how do you solve :
2x-6y=-16
5x+7y=-18
1 solutions
Answer 79058 by checkley71(8403) on 2007-11-06 19:14:44 (Show Source):
You can put this solution on YOUR website!multiply the first equation by 5 10x-30y=-80
now multiply the second equation by -2 -10x-14y=36
now add these two equations
10x-30y=-80
-10x-14y=36
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-44y=-44
y=-44/-44
y=1 answer
2x-6*1=-16
2x-6=-16
2x=-16+6
2x=-10
x=-10/2
x=-5 answer.
proof
5*-5+7*1=-18
-25+7=-18
-18=-18
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Travel_Word_Problems/108213: ron and doug leave the same point at the same time traveling in cars going in oppisite directions. ron travels at 40 miles per hour and doug travels at 60 miles per hour. in how many hours will the be 450 miles apart?
1 solutions
Answer 79056 by checkley71(8403) on 2007-11-06 19:02:40 (Show Source):
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expressions/108246: This question is from textbook Algebra 1
Beatriz is in charge of setting up a banquet hall. She has 5 tables that will seat 6 people each. if no more than 62 people will attend, how many tables seating 4 people each will she need?
1 solutions
Answer 79055 by checkley71(8403) on 2007-11-06 18:59:53 (Show Source):
You can put this solution on YOUR website!5*6=30 people seated at these tables
that leaves 62-30=32 to be seated at the 4 people tables. thus she'll need
32/4=8 table to seat the remaing 32 people.
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Equations/108425: I am trying to help my 9th grade brother with his homework. He does not have his text book or an example to how to do these problems. I was just plugging in his answers into the equations but know all his answers are wrong and we don't have an example to help us get the right answer.
Here is the question 2x-6y=-16
5x=7y=-18
Please help us!!! any help step by step would be greatly appreciated.
thank you
1 solutions
Answer 79053 by checkley71(8403) on 2007-11-06 18:49:00 (Show Source):
You can put this solution on YOUR website!multiply the first equation by 5 10x-30y=-80
now multiply the second equation by -2 -10x-14y=36
now add these two equations
10x-30y=-80
-10x-14y=36
--------------------------
-44y=-44
y=-44/-44
y=1 answer
2x-6*1=-16
2x-6=-16
2x=-16+6
2x=-10
x=-10/2
x=-5 answer.
proof
5*-5+7*1=-18
-25+7=-18
-18=-18
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Money_Word_Problems/108326: please help me
One family made a trip by car.
They traveled 1312 km in 3 days.
On the 2nd day, it is the number of km from the 1st day.
On the 3rd day, it is 98 km less than the 2nd day.
Find the distance Parcourue every day.
1 solutions
Answer 79052 by checkley71(8403) on 2007-11-06 18:47:40 (Show Source):
You can put this solution on YOUR website!day 1=x
day 2=x
day 3=x-98
x+x+x-98=1312
3x=1312+98
3x=1410
x=1410/3
x=470 number of km for days 1 & 2.
470-98=372 for day 3
proof
470+470+372=1312 total number of km driven.
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Expressions-with-variables/108416: Word problem where the sum equals 9.90 the question is how many are dimes and how many are quarters if there are twice as many dimes as quaters. How do you set up this word problem to arrive at the answers for the numbers of dimes and quarters.
1 solutions
Answer 79048 by checkley71(8403) on 2007-11-06 18:36:55 (Show Source):
You can put this solution on YOUR website!.10*2x+.25x=9.90
.20x+.25x=990
.45x=9.90
x=9.90/.45
x=22 number of quarters
2*22=44 number of dimes
proof
.10*44+.25*18=990
4.40+4.50=9.90
9.90=9.90
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