Svaries directly as t.
if s is 20 when t is 4, then t is
ao when s is 30.

6

Step-by-step explanation:

S is directly proportional to T

S=kT where k is any constant

In first case 20=k(4) which means k=5

Hence

S=kT

30=kT

30=5 (T)

=> T=6

answer: options

step-by-step explanation:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,