Can someone Help? thank you! :)

$3

Step-by-step explanation:

Since he’s leaving a 20% tip, we need 20% of 15.

To solve, multiply 20/100 (20%) by 15:

20/100*15 = 300/100 = 3

He will leave a $3 tip.

$3

Step-by-step explanation:

To solve this problem, first, one must convert the percent of the tip to decimal form. This can be done by dividing the percent by 100. Then one will multiply this value by the total bill.

20% * 15

= 0.2 * 15

= 3

I'm going to assume that you've done logarithms ("logs") in class
before you ran into this one on homework.

3(w to the -2/3 power) + 6= 198

Subtract 6 from each side:

3(w to the -2/3 power) = 192

Take the log of each side:

log(3) -(2/3) log(w) = log(192)

Subtract log(3) from each side:

-(2/3) log(w) = log(192) - log(3) . . . notice that this side is log(192/3) = log(64)

-(2/3) log(w) = log(64)

Divide each side by -(2/3) :

log(w) = -(3/2) log(64)

Raise 10 to the power of each side:

w = (64) to the -3/2 power .

==> (A number) to the -3/2 power means 1/(the number to the +3/2 power).

==> The 3/2 power means either find the number's square root and then cube it,
or else find the number's cube and then square root it.

w = 1 / (64 to the 3/2 power) = 1 / 512 .

That's choice ' B '.