In math and programming, we say that we evaluate a function when we replace the argument with a given number. So if we type sqrt(4), we evaluate the sqrt (square root) function. In R, you can evaluate a function inside another function. The evaluations happen from the inside out.

### Example

The logarithm with base 2 of 16 can be calculated using the following code:

log2(16)


The absolute value of -3 can be calculated by:

abs(-3)


The logarithm with base 2 of the absolute value of -16 can be calculated by:

log2(abs(-16))


#### Note

The functions are evaluated from the inside out.

### Exercise

Compute the logarithm with base 10 of the square root of 100. Do it with one line of code and do not make use of variables.