Answer:
4 miles per hour
Step-by-step explanation:
Let the miles jogged be directly proportional to the hours taken hence we say that m=kh where m is miles, k is constant of proportionality and h is the number of hours. Making k the subject of the formula then 
. Substituting miles jogged with 3.5 miles and hours with 7/8 hours as given then
Therefore, the constant of proportionality is 4 miles per hour
Answer:
x=-17
Step-by-step explanation:
A taxi ride where the total fare is $3, $2 for every mile travelled plus a $1 tip and the original cost of $20.
First write a formula that expresses the cost of the ride:
Total cost= Flat fee + Mileage + Tip
Now let's drop in what we know:
20= 3+2 (miles) +1 - we know the total cost is 20, the fee of 3, the tip of 1 and the cost per mile of 2. The only thing we don't know is the number of miles. So let's solve for that.
Subtract 3 and 1 from both sides to get:
16=2(miles)
Divide both sides by 2:
8=miles
Therefore, you traveled 8 miles.
500 + 10n = 15,000
Subtract 500 from each side:
10n = 14,500
Divide each side by 10 :
<span>n = 1,450 books</span>
