Answer:
k = 5
Step-by-step explanation:
Subtract both sides by 1/2:
k/2 = 5/2
Multiply both sides by 2:
k = 5
Answer:2974.125
Step-by-step explanation:
Price of a share is 41.25
and price of 70 shares = 
=2887.5
and broker charges =3%
i.e. 3% of 41.25=1.2375
For 70 shares=86.625
Therefore he paid=2887.5+86.625=$ 2974.125
Answer:
$15.17
Step-by-step explanation:
First we calculate the value for the sales tax:

we then add the value for the sales tax ($1.07) to the initial bill:

We were instructed to calculate the tip after the sales tax was added so:

after we will add the value for the tip to the value that we have for the bill ( this is the new value that includes the sales tax) to find the total cost:

<em>Therefore</em><em> </em><em>the</em><em> </em><em>total</em><em> </em><em>cost</em><em> </em><em>for</em><em> </em><em>his</em><em> </em><em>mean</em><em> </em><em>is</em><em> </em><em>$</em><em>15.17</em>
A rational expression is undefined if the denominator is zero. Since the denominator is
, the expression is undefined if
