F(x)=15.50+1.50x then to find how many he can ride, set your equation up like this 26=15.50+1.50x and solve. so, x=7. meaning mark can ride 7 rides in one day.
When we are thirsty, mental performance including memory, attention and concentration can decrease by about 10 per cent. Pupils concentrate better because they are not distracted by the effects of dehydration such as thirst, tiredness and irritability
