How many crew members in all were in expeditions 1 through 6? -in mathematics book page 6-7

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.

Suppose that 15 inches of wire cost 60 cents. at the same rate, how much (in cents) will 12 inches of wire cost

Twice the sum of a number and 2 is equal to three times the difference of the number and 8. find the number.