Question 120748
1. The rate, given that the distance is 200 feet and the time is x+3 seconds. 
Distance = RatexTime
Rate = Distance/Time
{{{R=200/(x+3)}}}


2. The perimeter of a rectangle, given that the length is x yards and the width is 10 yards shorter. 
Perimeter is 2 times the length plus 2 times width.
{{{P=2x+2(x-10)}}}
{{{P=4x-20}}}

3. gwen sold her car on consignment for x dollars. the saleswoman's commission was 10% of the selling price and Gwen received $6570. 
Gwen money = Selling price - Salewoman's commission
Gwen money = Selling price - 10%(Selling Price)
Gwen money = Selling price(1 - 10%)
{{{6570=x(1-10/100)}}}
{{{6570=x(0.90)}}}
{{{x=6570/0.90}}}
{{{x=7300}}}