Sarah is fighting a sinus infection. Her doctor prescribed a nasal spray and an antibiotic to ght the infection. The active ingredients, in milligrams, remaining in the bloodstream from the nasal spray, n(t), and the antibiotic, a(t), are modeled in the functions below, where t is the time in hours since the medications were taken.

The antibiotics has greater initial amount of active ingredient.

Explanation:

Okay, from the question we are given the equation for the medication formula for the Nasal spray and the antibiotics, they are given as equation (1) and (2) respectively;

n(t) = [ (t + 1) / (t + 5) ] + [18 / (t² + 8t + 15) ]. (1).

a(t) = 9 / (t+3) (2).

Immediately Sarah used the drug, let us say time,t = 0 is the time in which active ingredients(in milligrams) are much more concentrated in the bloodstream of Sarah.

Therefore at t =0, we are going to have;

n(0) = [ (0 + 1) / (0+ 5) ] + [18 / (0 + 8(0) + 15) ].

n(0) = (1/5 + 18/15).

n(0) = 1.4.

Also, for the antibiotics, the concentration at time,t = 0 is;

a(t) = 9 / (t+3).

a(0) = 9/ 0 + 3 = 9/3 = 3.

a(0) = 3.

The values of the Nasal spay is lesser than that of the value of the antibiotics, therefore we can come to conclusion that "The antibiotics has greater initial amount of active ingredient''.

c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.

the alkaline earth metals (beryllium (be), magnesium (mg), calcium (ca), strontium (sr), barium (ba), and radium (ra)) are a group of chemical elements in the s-block of the periodic table with very similar properties: shiny. silvery-white. hopefully this ? i didn't fully understand the question