PLEASE HELP DUE REALLY SOON WILL GIVE BRAINLIST IF CORRECT PLS AND TY!

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

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.