# Jichu

Most popular questions and responses by Jichu
1. ## Maximum value

Consider the function with rule f(x) = |x^2-ax|, where a is a positive constant. Find the maximum value of the function in the interval [0,a] How do you do find that?

2. ## Finding Range - Maths

Let f:{x: IxI > 100} => R, f(x) = 1/x^2. State the range of f. Let f:{x: IxI < 0.1} => R, f(x) = 1/x^2. State the range of f. *R = real numbers How do you find the two ranges? I know it sounds embarrassing but I am struggling to work out the range. Can you

3. ## Maths - Cartesian Equations

Find the corresponding Cartesian equation for each pair of parametric equations: x = t - (1/t) and y = 2*[t + (1/t)] The answer is y^2/16 - x^2/4 = 1 I have no idea where to begin. I tried squaring both equations in hope to easily remove t^2 but ended up

4. ## Maths - Parametric Equations

A circle is defined by the parametric equations x = 2cos(2t) and y = 2sin(2t) for t is all real numbers. (a) Find the coordinates of the point P on the circle when t = (4*pi)/3. (b) Find the equation of the tangent to the circle at P. Can you please show

1. ## math

4.09

posted on December 28, 2016
2. ## Concentration of Hydrofluoric Acid

Not entirely sure what you mean but u can determine the concentration if u know the moles and volume. Concentration = moles/volume

posted on December 28, 2016
3. ## SAT Math

72 students passed so 72/0.8 = 90 90/150 can be simplified to 3/5 Check my thinking

posted on December 28, 2016
4. ## Math

10 million = 10,000,000

posted on December 28, 2016
5. ## Math

41/24

posted on December 28, 2016
6. ## Maths

Area of bathroom floor = 5^2 = 25m^2 Area of bathroom tile = (0.15)^2 25/(0.15)^2 = approx 1111 tiles

posted on December 28, 2016
7. ## English

First of all, I personally will not write it for you because you need to learn to write by yourself. I can guarantee most of the tutors here will not write it for you either. Hint: Plan your story by creating a plot. Make sure it has a climax to be

posted on December 28, 2016
8. ## Math

Let x = distance Hint: Draw a diagram. You should realise it's Pythagoras theorem x^2 = 7^2 + 24^2 x^2 = 625 x = 25 Answer: 25m SE

posted on December 28, 2016
9. ## Math

Let x = one number and y = second number Hint: Equation #1: x+y=30 Equation #2: x^2 - y^2 = 180 x = 30-y (30-y)^2-y^2=180 y^2-60y+900-y^2=180 -60y=-720 y=12 x = 30-12 x=18

posted on December 28, 2016
10. ## value

Hierarchy (if that is what you mean...) A system or organization in which people or groups are ranked one above the other according to status or authority. [Google]

posted on December 27, 2016