Evaluate the log without a calculator ( show your work )

the problem is in the image. i don't know how to write it.

4

Step-by-step explanation:

Given in the question a logarithm expression

We will use Exponent of Log Rule

here b = 7

        k = 16

So suppose

Now, according to the rule

16 = x²

to find x only take square root on both sides of the equation

x = √16

x = 4

so = 4

a is the correct

arc length = 6.63311 ft.

step-by-step explanation:

the formula the arc measure is:

arc length s=2πr(c)/360

where:

c   is the central angle of the arc in degrees

r   is the radius of the arc

π   is pi, approximately 3.142

using the above formula we get

s =

thus we find that arc length of an arc for a circle of radius 20 feet and central angle 19 degrees is

6.63311 feet