The base of a cab in new york is $2.50 as soon as you enter the cab. there is an additional charge of $2.50 per mile traveled. calculate how many miles you can travel and $20 i'll giving any tip

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?