The sum of two numbers is 1000 and the difference between their sqares is 25600. then find the numbers.

512.8 + 487.2

Step-by-step explanation:

Let the two numbers be x and y respectively. The sum of x and y is 1000:

The difference between their squares is 25600:

We two unknowns(x and y) and two equations and therefore we can solve for x or y:

Lets:

and

We can simplify the expression as:

We can substitute x+y=1000 into this expression:

We can now write x in terms of y and vice verse, therefore:

We have simple expression and can substitute it into x+y=1000

therefore x can be solved by using the value of y and substituting it into x+y=1000:

the 3rd on is correct

step-by-step explanation:

22, 28, 34, 40, 46

b)   f(n) = 6n + 16

n = what is the number of the row ( 22 would be row 1) so if we replaced n with 1, we would get 22

c)   the 14th row will have 100 seats

(1)   (2)   (3)   (4)   (5)   (6)   (7)   (8)   (9)   (10) (11) (12) (13) (14)

22 | 28 | 34 | 40 | 46 | 52 | 58 | 64 | 70 | 76 | 82 | 88 | 94 | 100