Question

If D varies directly with t and D is 108 when t is 4, find D when t is 7.
35
189
432

Answer 1

Replace D with 108 and t with 4 and find k.

Answer 2

ok

Answer 3

108=k*4t

Answer 4

108=4k
Remember you are REPLACING t with 4 not multiplying t by 4

Answer 5

ok

Answer 6

whats next @Mertsj

Answer 7

So k is 27 right?

Answer 8

So now we have D = 27t
If someone tells us what t is we can solve for D. If they tell us what D is we can solve for t

Answer 9

In this problem they told us that t is 7 so replace t with 7 and find D

Answer 10

ok

Answer 11

how do i do that

Answer 12

Erase the t and write a 7 in its place.

Answer 13

Then multiply 27 times 7

Answer 14

189

Answer 15

yep

Answer 16

thankyou