Write each sum using summation notation.
2 + 4 + 6 + 8 + ⋯ + 100

Could somebody me with this radical simplification?

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same