Respuesta :
The expression you would use is 15 + .65x = 80. If you solve for x, Beth swam 100 laps.
Answer
Beth swam 100 laps.
Step-by-step explanation:
15+0.65x=80
15-15+0.65x=80-15
0.65x=65
0.65x/0.65=65/0.65
x=100