Do these rates form a proportion?
21 miles in 6hours and 14.3 miles in 3 hours

These rates DO NOT  form a proportion.

Step-by-step explanation:

Two quantities P and Q are said to be in proportion is and only if:

 for all values of P and Q.

here, k = Proportionality Constant.

Case 1: when P =  21 miles , Q  = 6 hours

⇒  k 1 = 3.5

Case 2: when P =  14.3 miles , Q  = 3 hours

⇒  k 2 = 4.76

As we can see in both the cases, k 1 ≠ k 2

Hence, P is NOT PROPORTIONAL to Q.

So, these rates DO NOT  form a proportion.

$2416.6

step-by-step explanation:

per hour = $ 25

total work time = 35

commission = 15%

total she has to make = $ 4,500

let she sold x dollar products

so her commission will be 15 % of x

now

total = weekly basic pay + commission

4500= (25*35) + 15 % of x

4500=875 + * x

4500-875 =   * x

3625= * x

multiplying wwith 100 on both sides gives

36250 = 15 x

now

x =  

x= $2416.6

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870