Tutors Answer Your Questions about Systems-of-equations (FREE)
Question 78797: I THINK slope-intercept form is supposed to be used to solve this question:
At the surface of the Atlantic Ocean, the water pressure is the same as the air pressure abov the water, 101.3 KPa (Kilo Pascal). Below the surface, the water pressure increases by 29.9 KPa for every 10 ft of descent. At what depth (approximated to the first digit) is the pressure 690 KPa?
Please help. :]
Click here to see answer by mathdoc314(58)  |
Question 78466: I'm just having trouble setting up this equation.
Find all values of b so that the straight line 3x-y=b touches the circle x^2+y^2=25 at only one point.
So I set it up as a system of equations and simplified the linear equation so I could use substitution:
y=3x-b
x^2+y^2=25
Then I tried to substitute {3x-b} for y in the circle equation:
x^2+(9x^2-6xb+b^2)=25
I was stuck as to where to go from here. Mainly, how do I find b?
Click here to see answer by renevencer22(21) |
Question 79579: I need to solve algebraically, then graph. Should I solve by elimination or substitution? Either way I'm running into a lot of mumbo jumbo. Your help and/or hints are greatly appreciated!
X^2 - 4Y^2 = 16
2Y - X = 2
Click here to see answer by elektrisitee(1) |
Question 79579: I need to solve algebraically, then graph. Should I solve by elimination or substitution? Either way I'm running into a lot of mumbo jumbo. Your help and/or hints are greatly appreciated!
X^2 - 4Y^2 = 16
2Y - X = 2
Click here to see answer by Earlsdon(6287) |
Question 82360: Can some one show me how to solve this problem?
Earth, Jupiter, Saturn, and Uranus all revolve around the sun. Earth takes 1 year, Jupiter 12 years, Saturn 30 years, and Uranus 84 years. How frequently do these four Planets line up with each other?
Click here to see answer by stanbon(57219) |
Question 82812: I have been over this one for two days now (messing with my weekend) and I still cant understand the book when it lays it out for me. If someone who is good in math could explain the steps for me that would be good for me.
a polynomial function of degree 5 with rational coefficients has 4, 2-the square root sign5 and 2+i as zeros. find the other zeros.
Click here to see answer by scott8148(6628)  |
Question 82815: i am still working on homework and i need help with another problem if someone has a kind enought heart to help!! the problem is:
6x^2_<20+7x thats one of those less than or equal things, now do i need to get the 6x^2 on the other side and set it to zero and solve it like a quadratic?
Click here to see answer by mjvictoria07(2) |
Question 82821: this question is not from the book even though i put in the imformation. its from a worksheet that we were given in class. and i know this is kind of something i should already know but i have missed a few classes and i still dont get how write infinities and unions. the question is:
(x-5)(x+4)(1-x)<0
i have looked over the book for help and think that it might be something to the effect of (-4,-1) U (5,infinity)
am i on the right track? could someone please tell me?
Click here to see answer by stanbon(57219) |
Question 82979: Solve by writing a system of equation.
a. Anne Matie has 52 coins in dimes and quarters which are worth $6.25. How many of each coin does she have.
b. John has a total of 9 stamps, which consists of 25 cent and 2 cent stamps. His stamps have a value of $1.10. How many of each stamp does he have?
c. It takes 4 h for a boat to travel 56 mil downstream. The same boat can 36 mil upstream in 6 hrs. Find the rate of speed of the boat in still water and the rate of the current
Click here to see answer by ankor@dixie-net.com(15624)  |
Question 83450: An open-top box is to be constructed from a 6 foot by 8 foot rectangular cardboard by cutting out equal squares at each corner and folding up the flaps. Let x denote the length of each side of the square to be cut out.
a.Find the function V that represents the volume of the box in terms of x.
b.Graph this function and show the graph over the valid range of the variable x.
c. Using the graph, what is the value of x that will produce the maximum volume?
Click here to see answer by Nate(3500) |
Question 83457: Turley Tailor Inc. makes long-sleeve, shortsleeve,
and sleeveless blouses. A long-sleeve blouse
requires 1.5 hours of cutting and 1.2 hours of sewing. A
short-sleeve blouse requires 1 hour of cutting and .9 hour of
sewing. A sleeveless blouse requires .5 hour of cutting
and .6 hour of sewing. There are 380 hours of labor available
in the cutting department each day and 330 hours in
the sewing department. If the plant is to run at full capacity,
how many of each type of blouse should be made each day?
Click here to see answer by stanbon(57219) |
Question 84317: .5c + 5a + 3s = 100
c + a + s = 100
There is a fair where childs tickets cost $0.50 and adults tickets cost $5.00 each and senior citizens tickets cost $3.00. The total amount of tickets sold adds up to be $100.00. The total number of tickets sold is 100 also. How many children, adults, and seniors went to the fair?
Click here to see answer by ankor@dixie-net.com(15624) |
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