Question

What is 2.1 times 10 to the power of -4

Answer 1

= 0.00021

Explanation:

This statement will be written as;

2.1*(10^-4)

Now to solve this expression. Notice that the exponent of 10 is negative

So we know that a^-b = 1/a^b

2.1*(1/10^4)

10^4 means multiply 10 four times:

2.1(1/10*1/10*1/10*1/10)

2.1(1/10,000)

2.1/10,000

=0.00021

Thus the answer is 0.00021....