What is 5 to the second power plus 2 the the fifth power plus 1

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Erik buys 2.5 pounds of cashews. if each pound of cashews costs $7.70, how much will he pay for the cashews?

Which is the standard form for this number? (2 x 10) + (5 x 1) + (8 x 1 10,000 )