The table shows different geologic time periods: period number of years ago jurassic 2.08 ⋅ 108 silurian 4.38 ⋅ 108 tertiary 6.64 ⋅ 107 triassic 2.45 ⋅ 108 order the time periods from oldest to youngest

Required order would be

Tertiary  > Silurian  >   Triassic  >  Jurassic

Step-by-step explanation:

Since we have given that

Period                          Number of years ago

Jurassic                        

Silurian                          

Tertiary                          

Triassic                          

We need to write in the order from oldest to youngest.

Since according to age, we get that Tertiary is the oldest and Jurassic is the  youngest among them.

So, Required order would be

Tertiary  > Silurian  >   Triassic  >  Jurassic

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.