Questions on Algebra: Graphs, graphing equations and inequalities answered by real tutors!

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Question 152652: Which of the following is a reflection of f(x) = -x + 1 about the x-axis?
r(x) = x + 1
r(x) = x - 1
r(x) = -( x - 1)
None of the above

Click here to see answer by mducky2(62)

Question 152837: Sketch the graph of a function for which the domain is all values of X and the rang is -2 < y < 2.
Click here to see answer by Fombitz(13828)

Question 152835: Rudy must play 12 commercials during his 1-hr radio show. Each commercial is either 30 sec or 60 sec long. If the total commercial time during that hour is 10 min, how many commercials of each type does Rudy play?

Click here to see answer by mducky2(62)

Question 152930: Find a slope of a line perpendicular to each given line.
0=3+x
-3y=12x+9
Click here to see answer by nabla(475)

Question 152929: How do you solve a system by graphing?
Click here to see answer by nabla(475)

Question 152962: 4x+3≤-5 and 3x-2<7
I tried on the first and got x≤-2 and the second x<3 but the answer is said to be x≤-3, I don't know if I'm doing it wrong, or the answer is just wrong.
Click here to see answer by edjones(7569)

Question 152958: Air Travel
An airplane flew for 4 hr with a 20-mph tailwind. the return flight against the same wind took 5 hr. Find the speed of the plane in still air
d + r (t)

distance rate time
with wind r + 20
d

Click here to see answer by edjones(7569)

Question 153007: can you please help me find the slope and y-intercept of: (((y=3x-5)))
Click here to see answer by jim_thompson5910(28598)

Question 152925: solve each system by graphing.
y=-1
y=5/2x+4
Click here to see answer by checkley77(12569)

Question 153090: Complete the the given ordered pairs for the queations and graph the equations: What are the correct steps to solve. Help
X-Y=3
(0__,),(___,0)
(5,__),(2,___)
6x-5y=30
(o,__),(___,0)
(3,__),(___,-2)

Click here to see answer by Earlsdon(6287)

Question 152959: Office Expense. The monthly phone expense for an office is $1094 less than the janitorial expense. Three times the janitorial expense minus four times the phone expense is $248. What is the total of the two expenses?

Click here to see answer by orca(409)

Question 153158: Please help!!!

A ball is thrown upward with an initial speed of 50ft/sec. It's height after t seconds is given by h=50t - 16t^2.
A) What is the height of the ball after 1.3 seconds?
B) When does the ball hit the ground?
For A, the answer I worked out is 37.96 feet.
For B, I worked out 25/8 seconds = t, which doesn't seem right. Can anyone help?
Thank you!!!!
Click here to see answer by stanbon(57412)

Question 153188: I have a graphing question. I am new to using graphing calculators. I have worked out the super basic understanding of how to use the function portion of my TI-84 Plus. However, when I key in y1 for f(x)=x2+x=-9, and I try to graph it and/or calculate it -- I never get the correct vertex -- which is suppose to be the ordered pair of (0.5,-9.25). I've tried working this so much, I am now completely confused. I know that my parabola opens upward because of the 1 co-effient. I know that it is to be a minimum. I've tried going into where I choose to calcuate the minimum. Yet I am missing something. I have to get this, otherwise, I am not able to proceed to continue my class. This is all online.
Click here to see answer by jim_thompson5910(28598)

Question 153190: I am so bad with math and they only way that im going to be able to pass this year is to get help. When a question is asking...Find the slope of each line. Then Graph.
54. y=8
57. x=9
60. x=-1/3
63. y=2/3
i dont understand how i am suppose to do that.
Click here to see answer by jim_thompson5910(28598)

Question 153206: Graph f(x)=10x-3
I did i went down three than up 10/1
Click here to see answer by jim_thompson5910(28598)

Question 153205: Graph f(x)=10x-3
I did i went down three than up 10/1
Click here to see answer by jim_thompson5910(28598)

Question 153204: Graph f(x)=10x-3
I did i went down three than up 10/1
Click here to see answer by jim_thompson5910(28598)

Question 153218: Find the equation of the line in point slope form that passes through (4,3)and is parallel to the line 3x-y=7.
Click here to see answer by jim_thompson5910(28598)

Question 153232: I need some help with parabolas. Can you please review my work and make suggestions where I have erred.
y = -2x**2 -12X -18 Label vertex, intercepts and Axis of symetry
Axis of symetry = -b/2a 12/-4 = -3
vertex = (-3, 36) y= 2(9) -12(-3) -18 = 18 + 36 -18 = 36
y Intercept y= -2(0) - 12(0) -18 = - 18
x Intercept 0 = -2x**2 -12x -18
=-2(x** + 6x + 9)
= (x + 3)(x+3)

=-3 Is this correct
Click here to see answer by oscargut(891)

Question 153223: on my book i have this question
graph the inequality
x>-2
and i dont get it can you help me
ohh and it asks for the open or close dot
cant you explain that to me

Click here to see answer by jim_thompson5910(28598)

Question 153254: thirteen less than three times n is 5 more than n.
Click here to see answer by ankor@dixie-net.com(15663)

Question 153256: three fourths the number b is 96.
Click here to see answer by stanbon(57412)

Question 153253: six less than twice a number is 16.
Click here to see answer by jojo14344(1512)

Question 153292: Plot the graph of the equations and interpret the result.
1. 3x - 8y = 5
4x - 2y = 11
2. 4x - 6y = 2
2x - 3y = 1
3. 10x - 4y = 3
5x - 2y = 2

Click here to see answer by jim_thompson5910(28598)

Question 153363: Please help. I am having trouble with a few problems. Thanks for listening.
evaluate the function:
g(x)=3.2x+2.8 when x=3, x=0 and x=-4

graph the line that has the given intercepts:
x intercept: -1/2
y intercept: -3

sketch graph of the inequality:
7y-2x=3<17
Click here to see answer by stanbon(57412)

Question 153746: y=-.25x+2

Click here to see answer by checkley77(12569)

Question 153797: How Do I Solve this inequality and graph it?? 6x-13 < 6(x-2)
Click here to see answer by checkley77(12569)

Question 153802: How do you do slope?
can you give me the best way of understanding slopes?
Click here to see answer by checkley77(12569)

Question 153823: What is the relationship of the slopes of perpendicular lins with slopes m1 and m2
Click here to see answer by josmiceli(9697)

Question 153814: what is the equation of the x-axis?

Click here to see answer by madhan_math(34)

Question 153795: How do I graph and solve this inequality?? 9(x+2) > 9(x-3)
Click here to see answer by checkley77(12569)

Question 153933: what does this look like plotted out on a graph? I want to grasp the knowledge but need to see it in front of me as an example. Thank you for your help.
y = |x| + 3
Click here to see answer by stanbon(57412)

Question 154001: how can you get 37.5% into day form to see how many hourse in a day that is?
Click here to see answer by checkley77(12569)

Question 154009: what is the perimeter of a square thats area is 38 m^2, what is it in meter?
Click here to see answer by checkley77(12569)

Question 154007: how can you get 12.5% into day form to see how many hours in a day that it?
Click here to see answer by checkley77(12569)

Question 153985: Write an inequality for each problem:
16. The difference of three times a number and 16 is at least 8.
18. Five less than the product of 6 and a number is no more than twice that same number.
Click here to see answer by nerdybill(6963)

Question 154008: two-thirds of the diameter of a cirlce that is 9/16 across and 9/16?
Click here to see answer by ankor@dixie-net.com(15663)

Question 154129: I need this graph! Not the explanation, but the graph itself. If anyone can help, I'd greatly appreciate it! Thank you
here's what I need:
the graph for:
3x - 1 = 5x - y
Simplifying
3x + -1 = 5x + -1y
Add '-5x' to each side of the equation.
-1 + 3x + -5x = 5x + -5x + -1y
Move all terms containing x to the left, all other terms to the right.
Add '-5x' to each side of the equation.
-1 + 3x + -5x = 5x + -5x + -1y
Combine like terms: 3x + -5x = -2x
-1 + -2x = 5x + -5x + -1y
Combine like terms: 5x + -5x = 0
-1 + -2x = 0 + -1y
-1 + -2x = -1y
Add '1' to each side of the equation.
-1 + 1 + -2x = 1 + -1y
Simplifying
x = -0.5 + 0.5y
I need the graph for that.
Click here to see answer by Earlsdon(6287)

Question 154130: I need the graph for this plotted out equation, please. Thank you!
x + 2 = 2x - 1
-----------
the work is done, I only need the graph now. Thank you.
x = 3
Since there's no y term, no matter what y is, x is 3. You can make any 2 points and connect them.
(3,0)
(3,3)
(3,-5)
(3,200)

Click here to see answer by Earlsdon(6287)

Question 154134: Discuss the symmetry of the function y = - x 5 / (x 2 – 8
Click here to see answer by stanbon(57412)

Question 154131: Find the function that is finally graphed after the following transformations are applied to the graph of y = / x /. The graph is shifted right 3 units, stretched by a factor of 3, shifted vertically down 2 units, and finally reflected across the x-axis.
Click here to see answer by stanbon(57412)

Question 154152: Marginal revenue. A defense attorney charges her client
$4000 plus $120 per hour. The formula R 120n 4000
gives her revenue in dollars for n hours of work. What is
her revenue for 100 hours of work? What is her revenue
for 101 hours of work? By how much did the one extra
hour of work increase the revenue? (The increase in
revenue is called the marginal revenue for the 101st hour.)
Click here to see answer by stanbon(57412)

Question 154153: Single women. The percentage of women in the 20–24 age
group who have never married went from 55% in 1970 to
73% in 2000 (Census Bureau, www.census.gov). Let 1970
be year 0 and 2000 be year 30.
a) Find and interpret the slope of the line through the
points (0, 55) and (30, 73).
b) Find the equation of the line in part (a).
c) What is the meaning of the y-intercept?
d) Use the equation to predict the percentage in 2010.
e) If this trend continues, then in what year will the
percentage of women in the 20–24 age group who have
never married reach 100%?
Click here to see answer by stanbon(57412)

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