A student had $40 but spent $32. What percentage of his money has he spent?​

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

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 ?