The population of a certain rare animal species increases exponentially according to the function P(t) = Poert, where Po is the initial
population, t is time measured in years, and r is a constant. If the
population increases from 20 to 80 in 4 years, what will the population be
in another 2 years? Simplify your answer as much as possible?

160

Step-by-step explanation:

It doubled twice in 4 years, so it will double again in the next two years.

No need to solve the equation for r.

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

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.