Monday, May 24, 2010

Difficult Math Problem?

So I'm doing math homework and it was all pretty easy until this came up.....I don't really know where to even begin somebody help please








Suppose you are at a gas station filling your tank with gas. The Function C(g) represents the cost C of filling up the gas tank with g gallons. Given the equation C(g)=3.03(g)





What does the Number 3.03 represent?





Find C(2)





Find C(9)





For the average motorist, name one value for g that would be inappropriate for this function's purpose. Explain why you chose the number you did.





If you were to graph C(g) what would be an appropriate domain? Range? Explain your reasoning.

Difficult Math Problem?
It is saying that it costs $3.03 per gallon of gas. It wants you to find out how much it costs when you buy two gallons of gas and nine gallons of gas. For two gallons, take 2 times $3.03, which is $6.06. For nine gallons, take 9 times $3.03, which is $27.27.





Then it asks for an inappropriate value for g (how many gallons a person buys). Obviously a negative number would not work.





For the domain and range, you can buy anywhere from zero gallons to an infinite amount, so it would be from zero to infinity.





I hope that this helps you!
Reply:Hey Patricia,


This is a typical function problem.


The number 3.03 represents the cost per gallon of gas.


So, for every one gallon you purchase, you have to pay $3.03.





When you are asked to find C(2), it is actually asking you to find the the cost of 2 gallons. So, just substitute 2 in for g in the equation. So you get:





C(2) = 3.03(2)


= 6.06





So, the cost of 2 gallons is $ 6.06.


Similarly, C(9) is 27.27.


So, the cost of 9 gallons is $27.27.





The one number that would be inappropriate is -1 or any negative number. Because you cannot buy -2 gallons!


It is just not logical.


So, any negative number would be inappropriate for this function.





If I am to graph C(g), the appropriate domain will be 0 to infinity.


As I said before, you cannot buy -1 gallons.


The range will be 0 to infinity because if you bought 0 gallons, the cost would be $ 0.





Hope that helps!
Reply:3.03 per gallon and then multiply x2 and then x9

morning glory

What are the answers to these math questions?

I am an idiot at math and my daughter needs help... What are the answers to these math questions?


1.What is 3/4 equal to? a)9/12 b)4/7 c)2/1 d)not here


2.What is equal to 8/4? a)32/16 b)1/2 c)16/4 d) not here


3.What is equal to 12/20? a)3/20 b)2/12 c) 6/10 d) not here


4.What is equal to 22/88? a) 88/22 b)2/11 c)8/2 d)not here


5.Which is both 6/12 %26amp; 10/20 equal to? a)20/240 b) 12/32


c)1/2 d)not here


6)Which is both 3/4 %26amp; 9/2 equal to? a)12/48 b) 75/100 c) 3/16


d) not here





So, please help me with these questions, she is having a hard time understanding.

What are the answers to these math questions?
Theses are cake questions. I sucked at high school math


1.A


2.A


2C


4.D


5,C


6D
Reply:too easy





1.What is 3/4 equal to? a)9/12


2.What is equal to 8/4? a)32/16


3.What is equal to 12/20? c) 6/10


4.What is equal to 22/88? d)not here


5.Which is both 6/12 %26amp; 10/20 equal to? c)1/2


6)Which is both 3/4 %26amp; 9/2 equal to? d) not here
Reply:1. A


2. A


3. C


4. D


5.C





Question number 6 should read 3/4 or 9.12 I believe and if thats the case the answer is...B
Reply:1 a. since 9/12 =(3*3)/(3*4) cancel out the 3's = 3/4


2 a. simplify 8/4 = 2/1 and 32/16 is also 2/1


3 c. 12/20 = 3/5 and 6/10 is also 3/5


4 d 22/88 = 1/4 , 88/22=4, 8/2 = 4


5 c. 6/12 = 1/2 and 10/20 also = 1/2


6 d. 3/4 and 9/2 are not equal





Hope this helps.
Reply:1. a)9/12


2. a)32/16


3. c) 6/10


4.d)not here


5. c)1/2


6. d) not here





i understand what you mean i am also kind of weak in maths but these were kind of easy now. They were hard to me when i doing these
Reply:1. 3/4 times by 3/3 and you get 9/12


2. 8/4 times by 4/4 and you get 31/16


3. 12/20 divide top and bottom by 2 and you get 6/10


4. 22/88 is no answer because you can times or divde by anything to get any of the answers given.


5. 6/12 divded by 6 and you get 1/2 10/20 divded by 10 and you get 1/2


6. 3/4 is no answer because you can times or divde by anything to get any of the answers given


Do math problems for a great prize!?

if u win u get to have 5 ratings and be chosen as best answer!





directions:use the formula F=9/5C+32 or C=5/9(F-32)to find a temperature in either degrees fahrenheit,F,or degrees celsius,C.





THERE WILL BE 4 PROBLEMS whoever ansers fist will get the prize plz help me im failing math clas!





1.what is the temperature in degrees fahrenheit when it is 0 degrees C?





2.what is the temperature in degrees fahrenheit when it is 100 degrees C?





3.what is the temperature in degrees Celsius when it is -4F?





4.what is the temperature in degrees celsius when it is 77 degrees F?

Do math problems for a great prize!?
1) 32* f (freezing)


2) 212* f (boiling)





you do the rest... subtract 32 then divide by 9 then mutiply by 5


to convert f to c





reverse it to do c to f





(try it out on the first two for practice)





good luck
Reply:ask your teacher for more help?
Reply:do your own homework
Reply:Celsius 0 = 32 Fahrenheit.





1. 0


2. 132


3. 28


4. 45
Reply:Use your formulas. I will show you one of each type.





2. F = (9/5)*100 + 32 = 180 + 32 = 212





3. C = (5/9)*(-4 -32) = (5/9)*(-36) = -20
Reply:do the math yourself!! if you keep asking ppl to do it for you you won't learn anything, 10 years later you'll still fail your maths


Can someone help me with math?

1) r2-5r+6/r2-4 How would i simplify that


2) f(4) = 0 and f(6) = 6, which of the following could represent f(x) The answer is 3x-12, but i do not know y thats the answer.


3) This year, 75% of the graduating class of Harriet Tubman High School had taken at least 8 math courses. Of the remaining class members, 60% had taken 6 or 7 math


courses. What percent of the graduating class had taken fewer than 6 math courses?


4) In an arithmetic series, the terms of the series are equally spread out. For example, in


1 + 5 + 9 + 13 + 17, consecutive terms are 4 apart. If the first term in an arithmetic series is 3, the last term is 136, and the sum is 1,390, what are the first 3 terms?





5) Listed below are 5 functions, each denoted g(x) and each involving a real number constant


c %26gt; 1. If f (x) = 2x, which of these 5 functions yields the greatest value for f (g(x)), for all


x %26gt; 1 ?


A. g(x) = cx


B. g(x) = c/x


C. g(x) = x/c


D. g(x) = x – c


E. g(x) = logcx


Can u explain!

Can someone help me with math?
1.Set the equation = to 0. Solve for r with multiplication and addition/subtraction.


2.The x variable is in the ()…as in f(x) is the same as f(4)=0 then 3(4)-12=0 and f(6)=6 then 3(6)-12=6 -----%26gt; both sides must be equal when you solve. and you will see that they are equal!





hmmm here's some more to ponder:


f(4)=0


3(4)-12=0


0=0





f(6)=6


3(6)-12=6


18-12=6


6=6








3.I don’t like percentages…sorry


4.Forgot how


5.See question 2’s answer


hope this helps a little
Reply:I assume #2 is multiple choice. In that case, you have to realize that when you see f(4), you replace every x in your expression with 4. So if f(4) = 0, then 3x-12 must equal 0. 3(4) - 12 = 12 - 12 = 0, so you're good. But you probably have more than one equation for which that works, so use the second fact (f(6) = 6) to figure out which is the right answer.





#3. 75% of the class had at least 8 math courses. Of the remaining 25%, 60% of those (15% of the total) had 6 or 7. So 75% + 15% had at least 6 math courses. So 100% - 75% - 15% = 10% had fewer than 6 math courses.





#4. It's hard to explain, but I'll try. If you add the first and the last terms together, and divide the total sum by that, you'll get the number of pairs in the series. You can then multiply that by 2 to get the number of terms in the series.
Reply:Hey Bluesky. Try this for #3. If 75% took 8 courses, then 25% took some other number of courses. A piece of info. is missing, so we will assume no one took MORE than 8 classes. Thus, 25% (100%-75% = 25%) took fewer than 8 courses. Of this remaining 25%, 60% took 6 or 7 courses (60% X 25% = 15%). So, if 75% took 8, and 15% took 6 or 7, (and no one took MORE than 8) then the remaining 10% must have taken fewer than 6!





Hope you find this helpful. Best wishes and good luck.
Reply:1. (r-3)(r-2)/(r-2)(r+2)


Simplied its


(r-3)/(r+2)


Math help please?

im confused with these five math problems from my homework. if anyone could help, i would really appreciate it!!





1. What is the measure of angle ABD if the measure of angle ABD is represented by 4x, the measure of angle DBC is represented by 3x and the measure of angle ABC is 77 degrees?


A. 7 B. 11 C. 33 D. 44





2. Which of the following interchanges the hypothesis with the conclusion?


A. biconditional B.counterexample C.converse D.definition





3. Choose the property that justifies:


If x= -6, then -6=x


A.Distributive Property for Real Numbers


B.Reflexive Property of Equality


C.Substitution Property of Equality


D.Symmetric Property of Equality


E.Transitive Property of Equality





4. Which of the following is the equation of a line with a zero slope that passes through (2, -4)?


A. y = -4 B. x = 2 C. y = x+4 D. x = y-2





5. Eighteen is the Geometric Mean of 12 and what number?


A. 30 B. 27 C. 24 D. 15

Math help please?
1. its a 4 sides figure? so 3x +4x +77 =360


so 7x = 287 so x=41


the rest is easy
Reply:4. zero slope means the line is horizontal, so the y value never changes.


y = -4








5. mean of 12 and another number x is (12 + x)/2


(12+x)/2 = 18


12+x = 36


x = 24
Reply:1. ABCD is a quadrilateral


so A B C D are in order





now from its figure we can say


%26lt;ABD + %26lt;DBC = %26lt;ABC [ %26lt; represents angle ]





=) 4x + 3x = 77 =) x =11


so %26lt;ABD = 4x = 44 Ans = D


3. B





if a =) b and b =) a means Reflexive property


here


a = x and b = -6





4. equation of a line in slope form





y = mx+c


given slope m = 0


=) y = c passes thru (2,-4) thn -4 = c


=) y = -4 Ans = A





5. let the number = x


so


sqrt(x*12) = 18


=) x*12 = 18*18 = 324


=) x = 27 Ans= B

geranium

Need help with math?

1)Quadrilateral MATH has vertices M(-1,4), A(4,7), T(7,2) and H(2,-1) Prove that MATH is a square.


2) In triangle ABC angle A=65 and angle C=60. Which is the shortest side of the triangle?


3) If tan A= 3/4 find angle A to the nearest degree.


4) In isoscles triangle ABC, AB is congruent to CB. Find angle B, if angle A=5x-4 and angle C=2x+20


5)The altitude to the hypotenuse of the right triangle divides the hypotenuse into two segments of lengths 3 and 12. What is the length of the altitude?


6) If the length of one side of a rectangle is 8 and the length of a diagnol is 10, find the area of the rectangle


7) Two consecutive angles of a parallelogram measure 2x+10 and x-10. What is the value of x?


8) Which quadrilateral must have congruent diagnols?


9)What is the y intercept of the graph of the equation y=2x^2-5x+7?


10)WXYZ os a parallelogram. YZ is extended to point V. WZ is congruent to VZ, and angle V=50. Find angle ZWX.


Step by step please? If you know any answer then please.

Need help with math?
1) find equations for each of the four lines. show that the opposite lines have parallel slopes. Then show that the lengths of all four lines are equal.





2) the side between the two smallest angles (B and C) will be the shortest. (sum angles = 180, so C=55)





3) tan^-1(.75) = .64





4) angle A = angle C. 2(5x-4) = (2x + 20). x = 3.5 A = C = 27


2(27) + B = 180. B = 126





5) 3,4,5 triangle. so sides are 9,12,15. i don't know how to finish





6) 3,4,5 triangle again. so second side of rectangle is 6. 6*8 = 48





7) consecutive angles sum to 180 degrees. 2x + 10 + x - 10 = 180. x = 60





8) rectangle





9) y intercept where x = 0. y intercept = 7





10) the way i drew this, angle ZVW and angle ZWV are congruent. so angle WZV equals 180-2*50 = 80. Therefore, angle WZY = 180 - 80 = 100. consecutive angles in a parallelogram sum to 180, so ZWX = 180 - 100 = 80


Bad Math Teacher help?

Well, before i went to middle school, i had A's and B+'s in math and i understood the material pretty well. But now i have this math teacher that really sucks. She just gives lessons as powerpoints and now i have a C. Most people have C in her class and maybe 5 people have a B but no A's. My parents think i'm just not trying hard enough and don't believe almost everyone has a C, D, or F. any tips?








The teacher also takes points off for things like, "I don't like how you showed your work", "you didn't check your work." I get the answer right but she still takes like half off.

Bad Math Teacher help?
So do you want one of us to come to your school and teach your class?
Reply:i used to have a really bad math teacher


but then i started sitting near the front


and taking notes and asking questions and stuff and my grades went up








i think ur best bet is to maybe take notes (if you don't know)


if you get homeworktime in class just ask her to come over and help u on some of the questions (even if u do get it it helps because then she'll see the 'problems in how u do ur work' and help u fix 'em








oh and if those don't work talk to her


if you don't get the material sometimes they have tudor sessions before or after school


so u can ask her for one of those
Reply:Bad math teacher ? Picky more like it. But you know what she expects, show your work and check your work. So if you do what she wants then she won't take off. It is so much easier to do well in a class with a teacher that spells out what she expects you to do.


She is actually trying to help you out. If you check your work you will be able to catch and correct the mistake . Showing your work will make it easier for you to check your work. It also will make it easier for anyone that is trying to help you, see where you made your error if you made one.
Reply:I have had the same problem before...beside your questions, put a small explaination of how you got that answer, or diagrams to show it. This might help you, because if you can prove that your answer is correct, there's no reason for the teacher to take a 1/2 mark off.





Also, if your parents don't believe you, ask them to have an interview with your teacher so they can discuss with her their concerns about your grades, and maybe she cna explain to them what's going on.





Good luck!