Khaled and wilma were asked to find an explicit formula for the sequence 1, 3, 9, 27. khaled said the formula is f(n)=1*3^n-1 and wilma said the formula is f(n)=1*3^n. which one of them is right?

ANSWER

EXPLANATION

The given sequence is 1, 3, 9, 27...

The first term of this sequence is

The common ratio is

The explicit formula for this geometric sequence is

We substitute the first term and the common ratio to obtain,

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.

graph b

step-by-step explanation:

one solution- graph a (clear intercepting point.)

no solution- graph b (they're parallel, there will never be a point of interception.)

infinite solutions- graph c (all points intercept.)