Algebra 1

$322$
Start with given expression: $s^4+t^2+s\div2$ Plug in values for $s$ and $t$: $4^4+8^2+4\div2$ The order of operations states that first we perform operations inside grouping symbols, such as parentheses, brackets, and fraction bars. Then, we simplify powers. Then, we multiply and divide from left to right. Finally, we add and subtract from left to right. Using this, we simplify the expression: Since there are no grouping symbols, we simplify exponents and then divide: $256+64+2$ Finally, we add and subtract: $256+64+2=322$