Now consider the expression 4.0×103+4×102. determine the values of a and k when the value of this expression is written in scientific notation.

Respuesta :

Let`s say that the expression is written in the form:a * 10^k.4 * 10^3 + 4 * 10^2 = = 4 * 10 * 10^2 + 4 * 10^2 = = 40 * 10^2 + 4 * 10^2 = = 44 * 10^2 = 4.4 * 10^3.Answer:a = 4.4 and k = 3 and the expression in the scientific notation is:4.4 * 10^3.

Answer:

The values of ''a'' and ''k'' are :

[tex]a=4.4[/tex]

[tex]k=3[/tex]

Step-by-step explanation:

If we want to write a number in scientific notation we can write it as :

[tex]a.(10)^{k}[/tex]    (I)

Where ''a'' is a real number and :

[tex]1\leq a<10[/tex]

Where ''k'' is an integer number.

The first step is to find the value of the expression.

The expression is :

[tex]4.(10)^{3}+4.(10)^{2}[/tex] ⇒

[tex]4.(10)^{3}+4.(10)^{2}=4000+400=4400[/tex]

We need to write the number ''4400'' in scientific notation.

We can write it as :

[tex]4400=(4.4).(10)^{3}[/tex]

If we compare this final expression with (I) ⇒

[tex]a=4.4[/tex]

[tex]k=3[/tex]