plz with these questions.for questions 1 and 2 , write each expression using a single exponent.1) x^9/x^22) h^14/h^5for questions 3 and 4, simplify each expression.3) 4^4/4^64) 5^0for questions 6-8, multiply the following polynomial.6) -2r( 8r + 5 )7) 4a( a^2 + 7a + 4 )8) ( 2y - 3 )( 3y - 2 )

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.