Please help! Transformations Algebra 2

Average salary for a medical assistant is $31,220 which is a 20% income tax bracket how much money would they pay in income tax?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Write a story that matches with the expression 42x-5 pls hurry