Why is aluminium used in circuit boards and batteries of mobile phones​

Aline passes through (1,-5) and(-3,7) write an equation for the line in point slope form rewrite the equation in slope intercept form

If you double the input of a function and it results in half the output, and if you triple the input and it results in a third of the output, what can be guessed about the function? check all that apply.

Given δjkl : δxyz, find x. a)10 b)12 c)16 d)20