# precalculus

1. ### Helpppppp piecewise function related!!

The picture below represents the graph of function f. Sketch the graph of the function g defined as follows: (in the picture)
2. ### Parabolas, Circles, Ellipses & Hyperbolas

Hey everyone! I am in precalculus trig right now and it's been about 7 years since my last math course. Can someone please tell me what I did wrong (probably my algebra?) in solving for the focus for this parabola. Given equation: x^2 + 4x + 2y +10 = 0 to change to standard form I got...
3. ### Pre-Calculus Help

The question is: Mario discovers that when he works the Miami heat games by himself he sells 1000 snow cones. When Sarah works with him, they sell an additional 10% more. When Mario, Sarah and Aaron all work together, they sell an additional 10% more than that. What is a geometric sequence for...
4. ### Precalculus help?

Directions: evaluate each of the functions at the indicated value of x. construct each of the functions, then find the domain. If f(x)={{3,5),(2,4),(1,7)}, g(x)=√(x-3), h(x)={3,2),(4,3),(1,6)}, and k(x)=x^2+5 1. (f+h)(1)= 2. (k-g)(5)= 3. (f·h)(3)= 4. (g·k)(7)= Directions: Construct...
5. ### Precalculus help?

Directions: evaluate each of the functions at the indicated value of x. construct each of the functions, then find the domain. If f(x)={{3,5),(2,4),(1,7)}, g(x)=√(x-3), h(x)={3,2),(4,3),(1,6)}, and k(x)=x^2+5 1. (f+h)(1)= 2. (k-g)(5)= 3. (f·h)(3)= 4. (g·k)(7)= Directions: Construct...
6. ### Matrix for rounding to the nearest whole number

Having trouble with part b. Is there a way to get a matrix calculation to round to the nearest integer?
7. ### Prove using Product to sum identities

Prove Cos (α – β) = cos α cos β + sin α sin β Hint:Keep the left side as is and use the Product to Sum Identities. Then, distribution to simplify the right side. I could really use some help on this..
8. ### Greetings - I am a member taking Precalculus and seeking help

Greetings to everyone Im a college student taking precalculus at the moment its a hard subject for me I do hope that this forum can help me out on some homework problems I have (Itwasntme) This is what im currently have trouble with and Im stuck at the moment. 1) Cell phones begin to lose...
9. ### Inverse Function Confusion...

Here is the problem I was faced with: ------------------------------ g(x)= x2+x+1 evaluateg(g-1(x)) ------------------------------ So I know that one way to solve this would be to find the inverse of g(x) and plug in whatever I get in to g(x). However, my teacher told me that if you plug in the...
10. ### I have been having trouble on this problem and would really appreciate some help

I've been trying to work through this problem for hours and I am not sure on how to go about solving this problem. Some help would be extremely appreciated. " Show the two synthetic division "lines" for the integral values on either side of the upper real zero of f(x)=x3-9x2-x-5 " I have...
11. ### First day of Pre-Calculus.

With my first day of Pre-Calculus down in the books I would like to share to you guys what I learned today. The first section covered Trigonometric functions of Acute angles, I learned the cosine, tangent, and sine functions, along with their reciprocals, Sectant, Cosectant, and Cotangent...
12. ### Precalculus Question STUCK ON!!

The number of bacteria in a refrigerated food product is given by N(T)=20T2−17T+2, 1<T<31 where T is the temperature of the food. When the food is removed from the refrigerator, the temperature is given by T(t)=5t+1.3 , where t is the time in hours. Find the composite function N(T(t))...
13. ### Circle, Radius, Distance, Area problem

Dear All, This question has been asked before but I did not understand any of the answers. I need a step by step break down of approach and reasoning to solve this problem. I will give the question and show my calculations thus far. Thank you for your help in advance. I have been working on...
14. ### What can I expect in Pre-Calculus? :)

What new formulas and topics will I learn in Pre-Calc? Any suggestions or advice for pre-work before the course starts? (Rock)(Evilgrin)
15. ### Precalculus Textbook for Students

What is the most student-friendly precalculus textbook that you can recommend for self-study? I had a Precalculus textbook by David Cohen from a Unit Circle Trigonometry perspective but gave it away because it is too mathematical for me and/or for most students.
16. ### *URGENT* Help with pre-calculus

Theres no pre-calculus section so i guess this is where it goes. Need help really quick. Gonna be kinda hard to explain but essentially its a question where i have to find a forumla of a line, easy. Only thing is you have to put domain restrictions and one of the lines (theres three in total)...
17. ### Rational roots

Hey guys! I'm in pre calculus not sure if this is the right forum but my problem says "list the possible rational roots of the equation. Then determine the rational roots" and the equation is x(to the 3rd) + 2x(to the 2nd) -6x +3=0 been working on it for an hour and am lost. Appreciate the help...
18. ### Help with problem

Hey guys my names Joey I'm new and there is something that I'm stuck on in math. How do I find the roots of the equation t(to the 3rd power) + 2t(to the 2nd power) – 4t – 8=0