# directly

7. ### Directly proportional

D is directly proportional to the square of t d=80 when t=4 so d=kt^2 k being the constant k=80/64 Work out the positive value of t when d=45 Can this be equated accurately without a calculator?
8. ### directly proportional problem

The number N of aluminum cans is directly proportional to the number of people P using them. It is known that 250 people use 60,000 cans a year. What is an equation of variation expessing N as a function of P? I know x and y (in this case 250 and 60,000) are directly proportional if y=kx..or...
9. ### Directly proportional to the square

What does this mean (question in the title). I need this to work out a question
10. ### Prove Compactness - Directly from definition

[SOLVED] Prove Compactness - Directly from definition Let K := \{1/n : n \in \mathbb{Z}^+\} \cup \{0\} .Prove that K is compact directly from the definition(without using Heine-Borel theorem). The definition of compactness I'm using is: A set K \subseteq \mathbb{R}^n is said to be compact...
11. ### sorry if this isnt directly algebra,

im sorry if this isnt directly algebra but in my exam papers its in the algebra Q a rectangle has a length 2√x cm and width √x cm the length of the diagonal of the triangle is √45 cm i) find the area of the rectangle ii) the area of the square is twice the area of the rectangle find the...
12. ### Type TeX directly into Word

Many of you have gotten comfortable with TeX/LaTeX as a result of this forum, so I wanted to let you know that with MathType 6.5 for Windows, you can now type TeX directly into Word and change the code into a MathType equation either by clicking a toolbar icon, or with the shortcut Alt+\. If you...
13. ### Text directly over objects

I know how to do things like \overbrace{\longrightarrow}^{\text{yay!}}...but how would I do this \longrightarrow^{\text{yay!}} but have it centered over the arrow. Same thing for something under like \max\left(\xi\right)_{x\in(-1,1)}
14. ### XY variables vary directly........

once... again... worksheet. The variables x y vary directly. Use the given values to write an equation that relates x and y x=8 , y =24 x=3 , y=36 I have no idea... how to do this