6. Jackson is starting an exercise program. The first day he will spend \( 30 \) minutes on a treadmill. He will increase his time on the treadmill by \( 2 \) minutes each day. Which linear equation represents this situation? \( T = \) time (in minutes) \( d = \) the number of days
\( T = 30 + 2 d \)
\( d = 2 T + 30 \)
\( T = 30 d + 2 \)
\( d = 30 T + 2\)
c
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 \( 40 \% \) ?
