X+y=5 3x-y=-5
is it no solutions, all solutions, or one solution?
please show your work.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

Pepe and leo deposits money into their savings account at the end of the month the table shows the account balances. if there pattern of savings continue and neither earns interest nor withdraw any of the money , how will the balance compare after a very long time ?