What are all of the the steps to get 6=1-2n+5

Write a recursive sequence that represents the sequence defined by the following explicit formula:

The ratio of two numbers is 5 to 4. the sum of the numbers is 99. what number is the greater of the two numbers?

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6