The simple interest on a sum of money invest-
ed for 6 months at 5% per annum is $1680
Determine the amount of money invested

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)