The height h (in inches) above the water of a pelican before a dive is modeled by h=-16t^2+70t+50, where t is time (in seconds)
a) when does the pelican enter the water
b)how high above the water is the pelican at time t=0 seconds

ANSWER

a) 5 seconds.

b) 50 inches.

EXPLANATION

The height of the pelican is modeled by,

The pelican enters the when

Divide through by negative 2,

Factor to obtain

This implies that,

Time cannot be negative, therefore the water after 5 seconds.

B) The height of the pelican is modeled by

When

The pelican was 50 inches above the water at time t=0.

answer: 10 meter

step-by-step explanation:

need details

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.