Help me please? ?

Question

2 When a bank pays interest on both the principal and the interest which an account already earned, the bank is paying ____ interest.

I know it starts off like comp but i dont know the rest.

#3 Simplify the Radical Expression by rationalizing the denominator:

7(square root)100

---------------------------

(square root)500

(that means over)

#4 The sum of two numbers is 82. Their difference is 24. Write the system of equations that describes his situation. Solve by elimination to find the two numbers.

A.) x+y=82 B.) x-y=82 C.) x+y=24 D.) x+y=82

x-y=24 x+y=24 y-x=82 x-y=24

48 and 24 52 and 30 48 and 30 53 and 29

#8 Find a solution to the following system of equations using elimination:

-5x + y = -5

-4x + 2y = 2

#10 Factor the expression: 4n^3 + 8n^2 - 5n - 10

Answer 1

compound interest

3. not sure of the problem

4. x + y = 82

    x - y = 24

  second equation solve for x, x = 24 + y substitute into first equation.

  24 + y + y = 82

  2y = 58

  y = 29

  Put y into equation solve for x;  x + 29 = 82,  x = 53.  

Answer 2

2. kompound interest

3. 70/sqt(500)=70/22.3606=3.1305

4. x+y=82

.....x-y=24

....2x=106, so x=53

& y=29

--------

8...-5x+y=-5

.....-10x+2y=-10

....    4x-2y=-2

add last 2 lines abuv & yu get -6x=-12 or x=+2