<span>As far as i know it is related to Gauss.

Write the sequences forward and backward first.

1 +2 +3 +.....+1002

1002+1001+1000+.....+1

--------------------------------------... Adding them

1003+1003+......(1002 times)

=1002x1003

But this contains the series twice.

So, the sum is = 1002x1003/2=501x1003=502503. answer</span>

**Answer:**

3ft

**Step-by-step explanation:**

Solve by elimination.

multiply the lower equation by negative 1.

-y=7x-21

-y+y=o

new equation is

7x+6-52=0

6-52 is -46

-7x=-46

divide by -7

x=6.57...

plug it back in

y= 7(6.57)+21

7*6.57= 46

y=46+21

y=67

(might be wrong, I tried)

**Step-by-step explanation:**

56,000÷7=8000

56,000÷70=800

56,000÷700=80

56,000÷7000=8

**Answer:**

7

**Step-by-step explanation:**

7 is the whole number and 1/3 is a fraction