Question

Given that d varies jointly with e and f and d = 2,100 when e = 12 and f = 35. we need to find d when e = 18 and f =40.

Answer 1

Answer:

A, D, E on edge

Step-by-step explanation:

Got it right!

pls mark brainiest..

Answer 2

Answer:

3600

Step-by-step explanation:

According to the question,

d varies jointly with e and f,

It means, $d = Kef$

Given,

d = 2,100

when,

e = 12 and f = 35,

Now,

put the value of all d, e, and f in d = Kef.

$2100 = K X 12 X 35\\\\K = \frac{2100}{420}\\\\K = 5$

when,

e = 18 and f =40,

Then,

$d = Kef\\\\d = 5 X 18 X 40\\\\d = 3600$

Hence, the value of d is equal to 3600.