Questions on Algebra: Functions, Domain, NOT graphing answered by real tutors!

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Question 984920: 3x+5y=10
How to find the domain
Click here to see answer by rothauserc(4718)

Question 984999: If f(x) = 3x + 2 and g(x) = 2x � 2, what is (f � g)(x)
Click here to see answer by jim_thompson5910(35256)

Question 984991: The size P of a certain insect population at time...t...(in days) obeys the function P (t)=400e^0.08t
A. Determine number of insects at t=0 days
B what is growth rate of insect population. _%
C what is population after 10 days
D when will insect population reach 480
E when will insect population double
Thank you. I appreciate you help.
Click here to see answer by josgarithmetic(39618)

Question 985415: What is the function of f(x)=1/x^4
Click here to see answer by Alan3354(69443)

Question 985455: Can someone explain this to me and how to approach it?
Which of the following functions satisfies the inequality
f(2)is less than f(-2)?
Answer choices:
A. f(x) = 2x^2 + 2
B. f(x) = 2x^2 - 2
C. f(x) = -2x^2 - 2
D. f(x) = 2x + 2
E. f(x) = -2x-2
Thank you.
Helen
Click here to see answer by josgarithmetic(39618)

Question 985521: 12a^5 b^-2/ 8a^-3 b^7
Click here to see answer by macston(5194)

Question 985933: The one-to-one functions and are defined as follows
g={(-2,9), (4,-2), (6,-4), (8,-1)}
h(x)=3x-13
Find the following:
=
=
=
Click here to see answer by josgarithmetic(39618)

Question 986045: What is the inverse of f(x)=5x^3-1
Click here to see answer by Boreal(15235)

Question 986050: Write the following expression in function notation. (Let f = length of your fingernails and m = time since your last manicure.)
Click here to see answer by stanbon(75887)

Question 985876: Find the equation of a rational function which has an oblique asymptote at y=2x+1, a vertical asymptote at x= -1, and a hole at (3,0).
Click here to see answer by josgarithmetic(39618)

Question 986279: What is the algebra domain of these two questions using algebraic sentence inequalities?
1.

2.
Click here to see answer by ikleyn(52794)

Question 986322: Can you check this for me?
X=7
X= -1
Find value of expression. (xy)^2
(7*-1)^2
-7^2
49 is answer
Thank you
Click here to see answer by Alan3354(69443)

Question 986320: A={-8, 2, 4, 1/2, -7.333...(3s repeat), 5pi sign}
From the set above which are:
A. Natural numbers
B. Rational numbers
C.integers
D. Irrational numbers
E. Real numbers
Click here to see answer by Edwin McCravy(20056)

Question 986356: How do I solve
f(x)=-2x-3 f(-1)

Click here to see answer by Alan3354(69443)

Question 986356: How do I solve
f(x)=-2x-3 f(-1)

Click here to see answer by Cromlix(4381)

Question 986447: Question:Evaluate the function when X=-3,0 and 2
how do you solve
Click here to see answer by stanbon(75887)

Question 986464: Determine the x-value of the point of intersection for the system represented by f(x) = 3 and g(x) = 5/(2 x + 1)
Click here to see answer by josgarithmetic(39618)

Question 986464: Determine the x-value of the point of intersection for the system represented by f(x) = 3 and g(x) = 5/(2 x + 1)
Click here to see answer by MathTherapy(10552)

Question 986459: Determine the x-value of the point of intersection for the system represented by f(x) = 3 and g(x) = 5/(2 x + 1)
Click here to see answer by josgarithmetic(39618)

Question 986439: f(x) -1 4 4 2 9 8 0
X 0 9 8 -3 2 -5 20. What is f(-3)
Click here to see answer by solver91311(24713)

Question 986491: Consider the graph of the function y = 2x. At what point will this graph intersect the x-axis?
Click here to see answer by solver91311(24713)

Question 986496: how do you find the minimum and maximum values and the range of a quadratic function?
for example, the given is:
Click here to see answer by solver91311(24713)

Question 986431: Evaluate the function at each specified value of the independent variable and simplify.
q(x) = 1/(x^2 − 9)

q(y + 3)=?
Click here to see answer by MathLover1(20850)

Question 986593: When finding the domain of f(x) = sqrt(x^2-8x-9) I factor to get (x-9)(x+1)>=0 but why is the domain. I understand why x>=9 but why is x<=-1? wouldn't they be the same direction?
Thank you
Click here to see answer by solver91311(24713)

Question 986617: Write 4x+y=10 in function form

Click here to see answer by macston(5194)

Question 986589: When finding the domain of: f(x) = sqrt(x+18) -3sqrt(x-10)
I know that the domain of of x+18>=-18 but why is the 2nd part x=+10, my main question is what happens to -3 does it become irrelevant and if so why?
Also, the domain is x>=+10 why isn't it including -18? wouldn't something like x>=-18 and x>=+10 make more sense?
Thanks
Click here to see answer by josgarithmetic(39618)

Question 986522: The domain of f(x) is the set of all real values except 7, and the domain of g(x) is the set of all real values except �3. Which of the following describes the domain of (gof)(x)
Click here to see answer by ikleyn(52794)

Question 986854: g(x)=x-2x^2
find the value of g(-3)+13
Click here to see answer by Timnewman(323)

Question 986969: What is the domain and range for y=x^2?
Click here to see answer by ikleyn(52794)

Question 987034: Can f(x) be defined at x = 8 so that f is continuous at 8? If so, give the value that f(8) needs to be?
Click here to see answer by stanbon(75887)

Question 987029: Electricity the table shows the relationship between resistance R and current I in a circuit
Resistance(ohms) 120 80 48 6 4
Current(amperes) 0.1 0.15 0.25 2 3
a. Is the relationship a function? Explain?
b. If the relation can be represented by the equation IR=12, rewrite the equation in function notation so that the resistance R is a function of the current I.
c. What is the resistance in a circuit when the current is 0.5 ampere?
Click here to see answer by Boreal(15235)

Question 987205: The slope of a line perpendicular to y=-2x+4 is:
A) 1/2
B) 1/4
C) 2
D) -2
E) -1/4
F) -1/2
Click here to see answer by solver91311(24713)

Question 987230: When exchanging US Dollars (USD) for Philippine Peso (PHP) the number of Philippine Pesos received is directly proportional to the number of US Dollars to be exchanged. If 450 USD can be converted into 16,029.45 PHP.
Find the constant of proportionality k.
k = (If needed, round answer to 3 decimal places.)
Using the k from above find the amout of PHP given that you have 700 USD to convert.
you will receive PHP (If needed, round answer to 2 decimal places.)

Click here to see answer by macston(5194)

Question 987359: Let f(x)= 4x - 7 and g(x)= 5 + 9x. What are f + g and f - g? What are their domains?
Click here to see answer by Boreal(15235)

Question 987496: For the function f(x) = 6-(1/x+3), answer the following questions:
A) Domain and range
B) 1 to 1 or not
C) Continuous or not (if continuous tell where)
D) Increasing, decreasing, both (if both tell where), or neither
E) Bounded above, bounded below, bounded, or unbounded (if unbounded, tell where)
F) Roots
Click here to see answer by Boreal(15235)

Question 987532: Find f 0 (0) for the function f(x) = sin−1 (x^2 + x) + 5x.
Click here to see answer by Alan3354(69443)

Question 987543: Find the domain and range and graph the following functions.
1. f(x)=5-x^2
2. f(x)=
3. f(x)=(x^2-4)/(x-2)

Click here to see answer by ikleyn(52794)

Question 987825: Please help me understand how to determine if these pairs of lines are perpendicular parallel or neither:
1. y = 4/3
2. -4x = 3
3. x = 4/3
Click here to see answer by ikleyn(52794)

Question 987834: Please help me determine whether the equation defines y as a function of x: 3x+7y=21
Click here to see answer by MathLover1(20850)

Question 988090: please help me understand how to determine if these pairs of lines are perpendicular parallel or neither:
1.y=-4x-4
2. 8x-2y=-2
3.y=4x+8
Click here to see answer by Boreal(15235)

Question 988096: (3/8,-6), (-6,5), (3/8,2), (5,-6)
Click here to see answer by Alan3354(69443)

Question 988248: If f(x) = x + 5 and g(x) = 6x, then what is g(f)(x) -- that is, what is the value of the composite function, where we start with function f and end with function g -- if our starting input is 3?
Click here to see answer by vleith(2983)

Question 988261: Hi,
I need some help with this function...
f(a+3)=2x^2+2x-3
I know how to find this much of the answer 2a^2+?+21. I am not sure how to find the middle number. Please show your work so I can figure out how to do it!
Thank you!
Click here to see answer by vleith(2983)

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