\(1 \) Given: the sequence \( 4,7,10,13 , \ldots \)
When using the arithmetic sequence formula \( a _ { n } = a _ { 1 } + ( n - 1 ) d \) to determine the \( 10 \) th term, which variable would be replaced with the number \( 3 \) ?
1) \( a _ { 1 } \)
2) \( n \)
3) \( a _ { n } \)
4) \( d\)
option '4' is correct
Joe earns \( \$ 9 \) per hour. He worked \( x \) hours on both Wednesday and Friday, and \( 8 \) hours on both Tuesday and Saturday. Write an expression to represent how much Joe earned.
If a virus spreads at a rate that can be modeled by the exponential function \( A ( t ) = ae ^ { r t } \) , how many people will be infected after \( 5 \) days if initially \( 3 \) people are infected and the growth rate is \( 40 \% \) ?
