Question

D is inversely proportional to r.

d = 7 when r = = 8
a) Use the information above to write an
equation for d in terms of r.
b) What is the value of d when r =
Give any decimal answers to 1 d.p.
= 5?

Answer 1

Answer: 11.2

Explanation:

a) d= k/r

=> 7= k/8

=> k= 7x8

therefore, k=56

b) d=k/r

=> d=56/ 5

so, d= 11.2