Lolo is saving for a concert ticket that costs $190. She has $15 and plans to save $25 each week until she can afford the concert ticket.

a. Is this arithmetic or geometric?

b. Write the simplified explicit formula for the sequence.

c. How many weeks will it take for Lolo to save up for the concert ticket?

d. Identify the domain and range for this sequence.

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?